Engine Fuel and Fuel Metering Systems
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119 Terms
The economizer system in a float-type carburetor
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keeps the fuel/air ratio constant.
functions only at cruise and idle speeds.
increases the fuel/air ratio at high power settings.
increases the fuel/air ratio at high power settings.
An aircraft engine equipped with a pressure-type carburetor is started with the
ANSWERS
primer while the mixture control is positioned at IDLE CUTOFF.
mixture control in the FULL-RICH position.
primer while the mixture control is positioned at the FULL-LEAN position.
primer while the mixture control is positioned at IDLE CUTOFF.
Select the correct statement concerning the idle system of a conventional float-type carburetor.
ANSWERS
The low-pressure area created in the throat of the venturi pulls the fuel from the idle passage.
Climatic conditions have very little effect on idle mixture requirements.
The low pressure between the edges of the throttle valve and the throttle body pulls the fuel from the idle passage.
The low pressure between the edges of the throttle valve and the throttle body pulls the fuel from the idle passage.
What should be checked/changed to ensure the validity of a turbine engine performance check if an alternate fuel is to be used?
ANSWERS
Fuel specific gravity setting.
Maximum RPM adjustment.
EPR gauge calibration.
Fuel specific gravity setting.
One of the things a metering orifice in a main air bleed helps to accomplish (at a given altitude) in a carburetor is
ANSWERS
pressure in the float chamber to increase as airflow through the carburetor increases.
a progressively richer mixture as airflow through the carburetor increases.
better fuel vaporization and control of fuel discharge, especially at lower engine speeds.
better fuel vaporization and control of fuel discharge, especially at lower engine speeds.
The device that controls the ratio of the air-fuel mixture to the cylinders is called a
ANSWERS
throttle valve.
mixture control.
metering jet.
mixture control.
What is the relationship between the accelerating pump and the enrichment valve in a pressure injection carburetor?
ANSWERS
No relationship since they operate independently.
Unmetered fuel pressure affects both units.
The accelerating pump actuates the enrichment valve.
No relationship since they operate independently.
Fuel pump relief valves designed to compensate for atmospheric pressure variations are known as
ANSWERS
compensated-flow valves.
pressurized-relief valves.
balanced-type relief valves.
balanced-type relief valves.
To determine the float level in a float-type carburetor, a measurement is usually made from the top of the fuel in the float chamber to the
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parting surface of the carburetor.
top of the float.
centerline of the main discharge nozzle.
parting surface of the carburetor.
Fuel is discharged for idling speeds on a float-type carburetor
ANSWERS
from the idle discharge nozzle.
in the venturi.
through the idle discharge air bleed.
from the idle discharge nozzle.
The economizer system of a float-type carburetor performs which of the following functions?
ANSWERS
It supplies and regulates the fuel required for all engine speeds.
It supplies and regulates the additional fuel required for all engine speeds above cruising.
It regulates the fuel required for all engine speeds and all altitudes.
It supplies and regulates the additional fuel required for all engine speeds above cruising.
An aircraft should be facing into the wind when trimming an engine. However, if the velocity of the wind blowing into the intake is excessive, it is likely to cause a
ANSWERS
false low exhaust gas temperature reading.
trim setting resulting in engine overspeed.
false high compression and turbine discharge pressure, and a subsequent low trim.
false high compression and turbine discharge pressure, and a subsequent low trim.
During engine operation, if carburetor heat is applied, it will
ANSWERS
increase fuel/air ratio.
increase engine RPM.
decrease the air density to the carburetor.
decrease the air density to the carburetor.
An excessively lean air-fuel mixture may cause
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an increase in cylinder head temperature.
high oil pressure.
backfiring through the exhaust.
an increase in cylinder head temperature.
The primary purpose of the air bleed openings used with continuous flow fuel injector nozzles is to
ANSWERS
provide for automatic mixture control.
maintain constant fuel pressure.
aid in proper fuel vaporization.
aid in proper fuel vaporization.
If an engine equipped with a float-type carburetor backfires or misses when the throttle is advanced, a likely cause is that the
ANSWERS
float level is too high.
main air bleed is clogged.
accelerating pump is not operating properly.
accelerating pump is not operating properly.
In order to stabilize cams, springs, and linkages within the fuel control, manufacturers generally recommend that all final turbine engine trim adjustments be made in the
ANSWERS
increase direction.
decrease direction.
decrease direction after over-adjustment.
increase direction.
Which of the following statements is true?
A. A positive displacement pump produces a continuous flow, but due to lack of a positive internal seal against slippage, its output will increase as pressure increases.
B. In a positive displacement pump, slippage is substantial compared to the pump’s volumetric output flow. If the output port were plugged, pressure would increase, and the pump pressure relief valve would close.
C. In a positive displacement pump, slippage is negligible compared to the pump’s volumetric output flow. If the output port were plugged, pressure would increase, and the pump pressure relief valve would open.
C. In a positive displacement pump, slippage is negligible compared to the pump’s volumetric output flow. If the output port were plugged, pressure would increase, and the pump pressure relief valve would open.
Kerosene is used as turbine engine fuel because
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kerosene has very high volatility which aids in ignition and lubrication.
kerosene has more heat energy per gallon and lubricates fuel system components.
kerosene does not contain any water.
kerosene has more heat energy per gallon and lubricates fuel system components.
If an aircraft engine is equipped with a carburetor that is not compensated for altitude and temperature variations, the air-fuel mixture will become
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leaner as either the altitude or temperature increases.
richer as the altitude increases and leaner as the temperature increases.
Richer as either the altitude or temperature increases.
Richer as either the altitude or temperature increases.
Why must a float-type carburetor supply a rich mixture during idle?
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Engine operation at idle results in higher than normal volumetric efficiency.
Because at idling speeds the engine may not have enough airflow around the cylinders to provide proper cooling.
Because of reduced mechanical efficiency during idle.
Because at idling speeds the engine may not have enough airflow around the cylinders to provide proper cooling.
One purpose of an air bleed in a float-type carburetor is to
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increase fuel flow at altitude.
meter air to adjust the mixture.
decrease fuel density and destroy surface tension.
decrease fuel density and destroy surface tension.
The Federal Aviation Regulations require the fuel flow rate for gravity systems (main and reserve) to be
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125 percent of the takeoff fuel consumption of the engine.
engine.
150 percent of the takeoff fuer consumption of the engine.
150 percent of the takeoff fuer consumption of the engine.
If the main air bleed of a float-type carburetor becomes clogged, the engine will run
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lean at rated power.
rich at rated power.
rich at idling.
rich at rated power.
An aircraft carburetor is equipped with a mixture control in order to prevent the mixture from becoming too
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lean at high altitudes.
rich at high altitudes.
rich at high speeds.
rich at high altitudes.
Under which of the following conditions will the trimming of a turbine engine be most accurate?
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High wind and high moisture.
High moisture and low wind.
No wind and low moisture.
No wind and low moisture.
A punctured float in a float-type carburetor will cause the fuel level to
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lower, and enrich the mixture.
rise, and enrich the mixture.
rise, and lean the mixture.
rise, and enrich the mixture.
Which of the following statements is true?
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The mixture used at rated power in air cooled reciprocating engines is leaner than the mixture used through the normal cruising range.
The mixture used at idle in air cooled reciprocating engines is leaner than the mixture used at rated power.
The mixture used at idle in air cooled reciprocating engines is richer than the mixture used at rated power.
The mixture used at idle in air cooled reciprocating engines is richer than the mixture used at rated power
What is the purpose of the flow divider in a turbine engine duplex fuel nozzle?
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Allows an alternate flow of fuel if the primary flow clogs or is restricted.
Creates the primary and secondary fuel supplies.
Provides a flow path for bleed air which aids in the atomization of fuel.
Creates the primary and secondary fuel supplies
It is desirable that fuel lines have a gentle slope upward or downward and not have sharp curves or sharp rises and/or falls in order to
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prevent vapor lock.
prevent stagnation or 'pooling' of fuel in the fuel lines.
minimize the generation of static electricity by decreasing fluid friction in the lines.
prevent vapor lock.
The desired engine idle speed and mixture setting
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is adjusted with engine warmed up and operating.
should give minimum RPM with maximum manifold pressure.
is usually adjusted in the following sequence; speed first, then mixture.
is adjusted with engine warmed up and operating.
What is the relationship between the pressure existing within the throat of a venturi and the velocity of the air passing through the venturi?
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There is no direct relationship between the pressure and the velocity.
The pressure is directly proportional to the velocity.
The pressure is inversely proportional to the velocity.
The pressure is inversely proportional to the velocity
Detonation occurs when the air-fuel mixture
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burns too fast.
ignites before the time of normal ignition.
is too rich.
burns too fast.
If an engine equipped with a float-type carburetor backfires or misses when the throttle is advanced, a likely cause is that the
Answer Choices
float level is too high.
main air bleed is clogged.
accelerating pump is not operating properly.
accelerating pump is not operating properly.
Float-type carburetors which are equipped with economizers are normally set for
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their richest mixture delivery and leaned by means of the economizer system.
the economizer system to supplement the main system supply at all engine speeds above idling.
their leanest practical mixture delivery at cruising speeds and enriched by means of the economizer system at higher power settings.
their leanest practical mixture delivery at cruising speeds and enriched by means of the economizer system at higher power settings.
What carburetor component measures the amount of air delivered to the engine?
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Economizer valve.
Automatic mixture control.
Venturi.
Venturi
A mixture ratio of 11:1 normally refers to
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a stoichiometric mixture.
1 part air to 11 parts fuel.
1 part fuel to 11 parts air.
1 part fuel to 11 parts air.
A full-authority electronic engine control (EEC) is a system that receives all the necessary data for engine operation and
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adjusts a standard hydromechanical fuel control unit to obtain the most effective engine operation.
develops the commands to various actuators to control engine parameters.
controls engine operation according to ambient temperature, pressure, and humidity.
develops the commands to various actuators to control engine parameters.
Excessively rich or lean idle mixtures result in
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too rapid completion of combustion.
incomplete combustion.
incomplete cylinder scavenging.
incomplete combustion.
What is a characteristic of a centrifugal-type fuel boost pump?
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It separates air and vapor from the fuel.
It has positive displacement.
It requires a relief valve.
It separates air and vapor from the fuel.
Prior to performing engine trimming, the aviation mechanic should
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call the control tower to obtain current sea level barometric pressure and temperature.
observe the reading on the aircraft outside air temperature (OAT) gauge.
obtain a true temperature reading comparable to that of the air that enters the engine.
obtain a true temperature reading comparable to that of the air that enters the engine.
For what primary purpose is a turbine engine fuel control unit trimmed?
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To obtain maximum thrust output when desired.
To properly position the power levers.
To adjust the idle RPM.
To obtain maximum thrust output when desired.
The fuel metering force of a conventional float-type carburetor in its normal operating range is the difference between the pressure acting on the discharge nozzle located within the venturi and the pressure
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acting on the fuel in the float chamber.
of the fuel as it enters the carburetor.
of the air as it enters the venturi (impact pressure).
acting on the fuel in the float chamber.
Idle cutoff is accomplished on a carburetor equipped with a back-suction mixture control by
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introducing low pressure (intake manifold) air into the float chamber.
turning the fuel selector valve to OFF.
the positive closing of a needle and seat.
introducing low pressure (intake manifold) air into the float chamber.
To determine the float level in a float-type carburetor, a measurement is usually made from the top of the fuel in the float chamber to the
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parting surface of the carburetor.
top of the float.
centerline of the main discharge nozzle.
parting surface of the carburetor.
Fuel pump relief valves designed to compensate for atmospheric pressure variations are known as
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compensated-flow valves.
pressurized-relief valves.
balanced-type relief valves.
balanced-type relief valves.
The function of the altitude compensating, or aneroid valve used with the Teledyne-Continental fuel injection system on many turbocharged engines is to
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prevent an overly rich mixture during sudden acceleration.
prevent detonation at high altitudes.
provide a means of enriching the mixture during sudden acceleration.
prevent an overly rich mixture during sudden acceleration.
When a new carburetor is installed on an engine,
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warm up the engine and adjust the float level.
do not adjust the idle mixture setting; this was accomplished on the flow bench.
and the engine is warmed up to normal temperatures, adjust the idle mixture, then the idle speed.
and the engine is warmed up to normal temperatures, adjust the idle mixture, then the idle speed.
In a supervisory EEC system, any fault in the EEC that adversely affects engine operation
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causes redundant or backup units to take over and continue normal operation.
usually degrades performance to the extent that continued operation can cause damage to the engine.
causes an immediate reversion to control by the hydromechanical fuel control unit.
causes an immediate reversion to control by the hydromechanical fuel control unit.
An electronic engine control (EEC) is a system that receives engine operating information and
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adjusts a standard hydromechanical fuel control unit to obtain the most effective engine operation.
develops the commands to various actuators to control engine parameters.
controls engine operation according to ambient temperature, pressure, and humidity.
adjusts a standard hydromechanical fuel control unit to obtain the most effective engine operation.
Fuel is discharged for idling speeds on a float-type carburetor
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from the idle discharge nozzle.
in the venturi.
through the idle discharge air bleed.
from the idle discharge nozzle.
Which of the following statements concerning a centrifugal-type fuel boost pump located in a fuel supply tank is NOT true?
Answer Choices
Air and fuel vapors do not pass through a centrifugal-type pump.
Fuel can be drawn through the impeller section of the pump when it is not in operation.
The centrifugal-type pump is classified as a positive displacement pump.
The centrifugal-type pump is classified as a positive displacement pump.
If fuel is found running from the carburetor with the engine not running, the likely cause is that the
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float needle valve is not seated properly.
float level is adjusted too low.
main air bleed is clogged.
float needle valve is not seated properly.
The metered fuel pressure (chamber C) in an injection-type carburetor
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is held constant throughout the entire engine operating range.
varies according to the position of the poppet valve located between chamber D (unmetered fuel) and chamber E (engine-driven fuel pump pressure).
will be approximately equal to the pressure in chamber A (impact pressure).
is held constant throughout the entire engine operating range.
In order to stabilize cams, springs, and linkages within the fuel control, manufacturers generally recommend that all final turbine engine trim adjustments be made in the
Answer Choices
increase direction.
decrease direction.
decrease direction after over-adjustment.
increase direction.
On a float-type carburetor, the purpose of the economizer valve is to
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provide extra fuel for sudden acceleration of the engine.
maintain the leanest mixture possible during cruising best power.
provide a richer mixture and cooling at maximum power output.
provide a richer mixture and cooling at maximum power output.
The device that controls the volume of the air-fuel mixture to the cylinders is called a
Answer Choices
mixture control.
metering jet.
throttle valve.
throttle valve.
A punctured float in a float-type carburetor will cause the fuel level to
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lower, and enrich the mixture.
rise, and enrich the mixture.
rise, and lean the mixture.
rise, and enrich the mixture.
Which statement is true regarding proper throttle rigging of an airplane?
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The throttle stop on the carburetor must be contacted before the stop in the cockpit.
The stop in the cockpit must be contacted before the stop on the carburetor.
The throttle control is properly adjusted when neither stop makes contact.
The throttle stop on the carburetor must be contacted before the stop in the cockpit.
Under which of the following conditions will the trimming of a turbine engine be most accurate?
Answer Choices
High wind and high moisture.
High moisture and low wind.
No wind and low moisture.
No wind and low moisture.
What should be checked/changed to ensure the validity of a turbine engine performance check if an alternate fuel is to be used?
Answer Choices
Fuel specific gravity setting.
Maximum RPM adjustment.
EPR gauge calibration.
Fuel specific gravity setting
What factor is not used in the operation of an aircraft gas turbine engine fuel control unit?
ANSWERS
Compressor inlet air temperature.
Mixture control position.
Power lever position.
Mixture control position.
What are the positions of the pressurization valve and the dump valve in a jet engine fuel system when the engine is shut down?
ANSWERS
Pressurization valve closed, dump valve open.
Pressurization valve open, dump valve open.
Pressurization valve closed, dump valve closed.
Pressurization valve closed, dump valve open.
The purpose of the back-suction mixture control in a float-type carburetor is to adjust the mixture by
ANSWERS
regulating the pressure drop at the venturi.
regulating the pressure on the fuel in the float chamber.
regulating the suction on the mixture from behind the throttle valve.
regulating the pressure on the fuel in the float chamber.
What could cause a lean mixture and high cylinder head temperature at sea level or low altitudes?
ANSWERS
Mixture control valve fully closed.
Defective accelerating svstem
Automatic mixture control stuck in the extended position.
Automatic mixture control stuck in the extended position.
What effect does high atmospheric humidity have on the operation of a jet engine?
ANSWERS
Decreases engine pressure ratio.
Decreases compressor and turbine RPM.
Has little or no effect.
Has little or no effect.
The fuel level within the float chamber of a properly adjusted float-type carburetor will be
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slightly higher than the discharge nozzle outlet.
slightly lower than the discharge nozzle outlet.
at the same level as the discharge nozzle outlet.
slightly lower than the discharge nozzle outlet.
Which of the following is NOT an input parameter for a turbine engine fuel control unit?
ANSWERS
Compressor inlet pressure.
Compressor inlet temperature
Ambient humidity.
Ambient humidity.
What are the principal advantages of the duplex fuel nozzle used in many turbine engines?
ANSWERS
Restricts the amount of fuel flow to a level where more efficient and complete burning of the fuel is achieved.
Provides better atomization and uniform flow pattern.
Allows a wider range of fuels and filters to be used.
Provides better atomization and uniform flow pattern.
Select the statement which is correct relating to a fuel level check of a float-type carburetor.
ANSWERS
Use 5 pounds fuel pressure for the test if the carburetor is to be used in a gravity fuel feed system.
Block off the main and idle jets to prevent a continuous flow of fuel through the jets.
Do not measure the level at the edge of the float chamber.
Do not measure the level at the edge of the float chamber.
Which method is commonly used to adjust the level of a float in a float-type carburetor?
ANSWERS
Lengthening or shortening the float shaft.
Add or remove shims under the needle-valve seat.
Change the angle of the float arm pivot.
Add or remove shims under the needle-valve seat
At what engine speed does the main metering jet actually function as a metering jet in a float-type carburetor?
ANSWERS
All RPM's.
Cruising RPM only.
All RPM's above idle range.
All RPM's above idle range.
What causes the fuel divider valve to open in a turbine engine duplex fuel nozzle?
ANSWERS
Fuel pressure.
Bleed air after the engine reaches idle RPM.
An electrically operated solenoid.
Fuel pressure.
What is the possible cause of an engine running rich at full throttle if it is equipped with a float-type carburetor?
ANSWERS
Float level too low.
Clogged main air bleed.
Clogged atmospheric vent.
Clogged main air bleed.
What is the purpose of an engine-driven fuel pump bypass valve?
ANSWERS
To divert the excess fuel back to the main tank.
To prevent a damaged or inoperative pump from blocking the fuel flow of another pump in series with it.
To divert the excess fuel from the pressure side of the pump to the inlet side of the pump.
To prevent a damaged or inoperative pump from blocking the fuel flow of another pump in series with it.
Which of the following best describes the function of an altitude mixture control?
ANSWERS
Regulates the richness of the fuel/air charge entering the engine.
Regulates the air pressure above the fuel in the float chamber.
Regulates the air pressure in the venturi.
Regulates the richness of the fuel/air charge entering the engine.
Where is the main fuel strainer located in the aircraft fuel system?
ANSWERS
At the highest point in the fuel system.
At the lowest point in the fuel system.
At the inlet chamber of the carburetor.
At the lowest point in the fuel system.
The fuel systems of aircraft certificated in the standard classification must include which of the following?
ANSWERS
An engine-driven fuel pump and at least one auxiliary pump per engine.
A positive means of shutting off the fuel to all engines.
A reserve supply of fuel, available to the engine only after selection by the flightcrew, sufficient to operate the engines at least 30 minutes at METO power.
A positive means of shutting off the fuel to all engines.
The primary condition(s) that allow(s) microorganisms to grow in the fuel in aircraft fuel tanks is (are)
ANSWERS
warm temperatures.
the presence of water.
the presence of dirt or other particulate contaminants.
the presence of water.
What method is ordinarily used to make idle speed adjustments on a float-type carburetor?
ANSWERS
An adjustable throttle stop or linkage.
An orifice and adjustable tapered needle.
An adjustable needle in the drilled passageway which connects the airspace of the float chamber and the carburetor venturi.
An adjustable throttle stop or linkage.
Which of the following best describes the function of an automatic mixture control (AMC)?
ANSWERS
It compensates for change in the air density due to temperature and altitude.
It compensates for the air pressure above the fuel in the float chamber.
It compensates for the air pressure in the venturi of a float-type carburetor.
It compensates for change in the air density due to temperature and altitude.
Which of the following best describes the function of an automatic mixture control (AMC)?
ANSWERS
It compensates for change in the air density due to temperature and altitude.
It compensates for the air pressure above the fuel in the float chamber.
It compensates for the air pressure in the venturi of a float-type carburetor.
It compensates for change in the air density due to temperature and altitude.
What is the purpose of the carburetor accelerating system?
ANSWERS
Supply and regulate the fuel required for engine speeds above idle.
Temporarily enrich the mixture when the throttle is suddenly opened.
Supply and regulate additional fuel required for engine speeds above cruising.
Temporarily enrich the mixture when the throttle is suddenly opened.
The purpose of the diaphragm in most vane-type fuel pumps is to
ANSWERS
maintain fuel pressure below atmospheric pressure.
equalize fuel pressure at all speeds.
compensate fuel pressures to altitude changes.
compensate fuel pressures to altitude changes.
The purpose of the diaphragm in most vane-type fuel pumps is to
ANSWERS
maintain fuel pressure below atmospheric pressure.
equalize fuel pressure at all speeds.
compensate fuel pressures to altitude changes.
compensate fuel pressures to altitude changes
When air passes through the venturi of a carburetor, what three changes occur?
Velocity increases, temperature increases, and pressure decreases.
Velocity decreases, temperature increases, and pressure increases.
Velocity increases, temperature decreases, and pressure decreases.
Velocity increases, temperature decreases, and pressure decreases.
If the idling jet becomes clogged in a float-type carburetor, the
ANSWERS
engine operation will not be affected at any RPM.
engine will not idle.
idle mixture becomes richer.
engine will not idle.
What corrective action should be taken when a carburetor is found to be leaking fuel from the discharge nozzle?
Answer Choices
Replace the needle valve and seat.
Adjust the mixture control.
Adjust throttle linkage.
Replace the needle valve and seat.
Which type of pump is commonly used as a fuel pump on reciprocating engines?
Answer Choices
Gear.
Impeller.
Vane.
Vane
Generally, the practice when trimming an engine is to
Answer Choices
turn all accessory bleed air off.
turn all accessory bleed air on.
make adjustments (as necessary) for all engines on the same aircraft with accessory bleed air settings the same either on or off.
turn all accessory bleed air off.
It is necessary to control acceleration and deceleration rates in turbine engines in order to
Answer Choices
prevent blowout or die-out.
prevent overtemperature.
prevent friction between turbine wheels and the case due to expansion and contraction.
prevent blowout or die-out.
A carburetor is prevented from leaning out during quick acceleration by the
Answer Choices
power enrichment system.
mixture control system.
accelerating system.
accelerating system.
When trimming a turbine engine, the fuel control is adjusted to
Answer Choices
produce as much power as the engine is capable of producing.
set idle RPM and maximum speed or EPR.
allow the engine to produce maximum RPM without regard to power output.
set idle RPM and maximum speed or EPR.
When air passes through the venturi of a carburetor, what three changes occur?
Answer Choices
Velocity increases, temperature increases, and pressure decreases.
Velocity decreases, temperature increases, and pressure increases.
Velocity increases, temperature decreases, and pressure decreases.
Velocity increases, temperature decreases, and pressure decreases.
An aircraft should be facing into the wind when trimming an engine. However, if the velocity of the wind blowing into the intake is excessive, it is likely to cause a
Answer Choices
false low exhaust gas temperature reading.
trim setting resulting in engine overspeed.
false high compression and turbine discharge pressure, and a subsequent low trim.
false high compression and turbine discharge pressure, and a subsequent low trim.
One of the best ways to increase engine power and control detonation and preignition is to
Answer Choices
enrich the fuel/air mixture.
use water injection.
lean the fuel/air mixture.
use water injection.
When troubleshooting an engine that will not idle, what would be a probable cause?
Answer Choices
Economizer valve not operating correctly.
Mixture setting too rich.
Manifold valve is not operating properly.
Economizer valve not operating correctly.
The desired engine idle speed and mixture setting
Answer Choices
is adjusted with engine warmed up and operating.
Should give minimum RPM with maximum manifold pressure.
is usually adjusted in the following sequence; speed first, then mixture.
is adjusted with engine warmed up and operating.
What is the purpose of the carburetor accelerating system?
Answer Choices
Supply and regulate the fuel required for engine speeds above idle.
Temporarily enrich the mixture when the throttle is suddenly opened.
Supply and regulate additional fuel required for engine speeds above cruising.
Temporarily enrich the mixture when the throttle is suddenly opened.
What precaution should be taken when putting thread lubricant on a tapered pipe plug in a carburetor float bowl?
Answer Choices
Put the thread lubricant only on the first thread
Do not use thread lubricant on any carburetor fitting.
Engage the first thread of the plug, then put a small amount of lubricant on the second thread and screw the plug in.
Engage the first thread of the plug, then put a small amount of lubricant on the second thread and screw the plug in.