Diesel Fuel Supply

Technician A says that secondary fuel filters are usually in the range of 5-7 microns. Technician B says that primary fuel filters are usually in the range of 20-25 microns. Who is correct?

Technician A.

Technician B.

Both A and B.

Neither A nor B.

Correct! Wrong!

Technician A says that the primary fuel filter is usually on the suction side of the transfer pump. Technician B says that the secondary fuel filter is usually on the suction side of the transfer pump. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B

Correct! Wrong!

How will a diesel engine perform when operating on fuel with a high cetane rating in the summer time?

with less power

with more power

with no change in power

with possible pump damage

Correct! Wrong!

A fuel pressure gauge test on an engine may indicate

transfer pump pressure

fuel filter condition

the recommended pressure at an idle and run positions

all of the above

Correct! Wrong!

The primary fuel filter on an engine is on the _____________ side of the fuel pump.

outlet

fuel return

Correct! Wrong!

To determine if the fuel transfer pump for an injection system is operating efficiently, you must test for

pressure, volume and spill back.

pressure, flow and volume.

speed, air bubbles and pressure.

pressure only.

Correct! Wrong!

Generally, with a mechanical fuel pump, motion is provided to the diaphragm by

a crankshaft.

a special pulley.

a camshaft

an electric motor.

Correct! Wrong!

All fuel lines in the vehicle that are attached to the frame or engine are made of specialized composite materials or

copper.

aluminum.

steel.

rubber.

Correct! Wrong!

In a diaphragm type fuel transfer pump, the maximum possible output would be limited by

the speed of the engine.

the arm pushing on the diaphragm.

the spring pushing on the diaphragm.

the height of the cam lobe.

Correct! Wrong!

A fuel transfer pump

pumps more fuel than is required by the engine.

pumps just as much fuel as required by the engine.

is centrifugal.

is only required in order to prime the filters.

Correct! Wrong!

When you install a new or reconditioned plunger supply pump on an engine with a diesel injection system you must make sure that

it has the right volume and pressure rating.

the internal gears are the same pitch and diameter.

the fitting sizes are consistent with the old pump.

the direction of rotation is correct.

Correct! Wrong!

As compared to a direct injection chamber, an engine equipped with pre-combustion chambers will

have lower combustion pressures.

burn a wide range of fuel.

have lower injection pressures.

all of the above are correct.

Correct! Wrong!

Some diesel engines have the fuel inlet and return lines cast as part of the cylinder head, while others have separate lines for inlet and return.

True

False

Correct! Wrong!

The lbs. of fuel consumed per brake horsepower per hour that is used by an engine, is known as

thermal efficiency.

volumetric efficiency.

horsepower.

brake specific fuel consumption.

Correct! Wrong!

Rapidly and easily ignited diesel fuels would have a ____________ cetane rating.

high

low

fast

slow

Correct! Wrong!

The filter type that is removed and replaced as a complete filter unit is

the replaceable element filter.

the spin-on filter.

the oil bath filter.

the cartridge element filter.

Correct! Wrong!

The most commonly used diesel fuel in the equipment industry for the majority of the year, temperature permitting, is known as

#1 Diesel.

#2 Diesel.

#3 Diesel.

#4 Diesel.

Correct! Wrong!

A diesel fuel with a high viscosity rating

is thick and flows more slowly.

is thin and flows more quickly .

is thin and flows more slowly.

none of the above.

Correct! Wrong!

The cloud or wax point of a diesel fuel can be defined as

the lowest temperature at which it will flow.

the temperature at which a cloud or haze of wax crystals will form.

the highest temperature before evaporation begins.

the temperature at which the fuel begins to freeze.

Correct! Wrong!

The centreline of a fuel storage tank should be mounted on a slight downward angle so that

fuel will collect at one end for withdrawal.

water and sediment will collect the lower end for drainage.

condensation will not form as readily.

the tank will be more stable.

Correct! Wrong!

1D fuel is best suited for summer use and has a higher BTU rating than 2D fuel.

True

False

Correct! Wrong!

Diesel fuel cetane rating indicates

ignition quality.

resistance to detonation.

cloud point.

pour point.

Correct! Wrong!

Diesel contains the highest heat value of fuels used in internal combustion engines.

True

False

Correct! Wrong!

Octane refers to the fuels ability to

burn.

evaporate.

ignite.

resist detonation.

Correct! Wrong!

Volatility refers to the fuels ability to

burn.

ignite.

vaporize.

condense.

Correct! Wrong!

Oxygen makes up approximately _______ % of the air.

1

11

21

31

Correct! Wrong!

Charles'' Law states that under constant pressure, the ____________ of a gas varies directly with its absolute temperature.

mass

volume

weight

all of the above

Correct! Wrong!

Boyle''s Law states that if the _______________ on a gas in a confined space is doubled, the gas will be compressed to half its original volume, provided the temperature remains the same.

weight

light

pressure

all of the above

Correct! Wrong!

The resistance of a liquid to flowing is called

intensity.

viscosity.

volatility.

cetane.

Correct! Wrong!

Technician A says that you would require a fuel with a higher cetane rating when encountering lower engine temperatures when starting. Technician B says that the lower the ambient temperature, the greater the need for a fuel that will ignite rapidly. Who is correct?

Technician A

Technician B

Both A and B

Neither A nor B

Correct! Wrong!

The temperature at which fuel will no longer flow through a fuel line is known as

pour point.

cloud point.

flash point

all of the above.

Correct! Wrong!

The temperature at which the wax in fuel separates is known as

pour point.

cloud point.

flash point.

all of the above.

Correct! Wrong!

The degree of filtration in a filter is measured in

electrons.

protons.

neutrons.

microns.

Correct! Wrong!

What is cetane required to do as an additive?

to decrease the fuel burn rate to resist knock.

to decrease engine pre-ignition.

to adjust the ability of the fuel to burn cleanly.

to change the ability of a fuel to ignite.

Correct! Wrong!

Gasoline, diesel fuel, propane and natural gas are all derived from crude oil or petroleum and is made up of hydrogen and

carbon.

oxygen.

nitrogen.

ethane.

Correct! Wrong!

There is a delay between the time that fuel is injected into the cylinder and the time that ignition by the hot air takes place. The duration of this delay is expressed as a(n) __________ number.

octane

cetane

distillation and point

viscosity

Correct! Wrong!

Fuel with a high sulphur content is likely to cause

excessive engine wear.

acid build up in the crankcase.

excessive wear on lines, pistons and rings.

all of the above.

Correct! Wrong!

Which of the following may cause a low power complaint?

plugged air cleaner

dirty fuel filters

faulty injector

all of the above

Correct! Wrong!

On a fuel injection pump system, what is the purpose of the restricted fitting in the return fuel line at the outlet of the fuel pump?

acts as a relief valve for the transfer pump.

maintains transfer pump pressure.

prevents injectors from receiving fuel pressure.

keeps the fuel lines from draining back to the fuel tank.

Correct! Wrong!

What engine performance measurement is found by using the following formula: Torque x RPM divided by 5252?

torque.

horsepower.

mean effective pressure.

volumetric efficiency.

Correct! Wrong!

An injector failure can occur because of

water contaminated diesel fuel.

gasoline in a diesel fuel system.

overuse or misuse of fuel additives.

all of the above.

Correct! Wrong!

The fuel/water separator filter or sight glass should be drained

daily.

weekly.

monthly.

annually.

Correct! Wrong!

Excessive cylinder temperatures are the major cause of ___________ formation.

NOx

CO

CO2

HC

Correct! Wrong!

Fuel heaters should be thermostatically controlled because

high fuel temperature will cause a loss of horsepower.

ignition of the fuel will be advanced.

the engine will "knock" or pre-ignite.

the fuel lines will become brittle.

Correct! Wrong!

The factor(s) that affect the ignition delay period are

injection timing.

air quality.

fuel quality.

all of the above.

Correct! Wrong!

Starting fluid should not be used in combination with engines which have

low compression.

turbochargers.

glow plugs or manifold heaters.

fuel heaters.

Correct! Wrong!

Contaminated or dirty fuel may cause

fuel filters to plug.

damage to the fuel pump.

damage to the injectors.

all of the above.

Correct! Wrong!

Diesel fuel conditioner will dissolve ice in the fuel tank.

True

False

Correct! Wrong!

Using winter fuel in the summer time may cause

excessive wear on fuel system components.

loss of engine performance.

poorer fuel economy.

all of the above.

Correct! Wrong!

Using summer fuel in the winter time may cause

the fuel to break down.

the fuel to thin out.

separation of the fuel oil and the wax.

none of the above.

Correct! Wrong!

Technician A says that secondary fuel filters are usually in the range of 5-7 microns. Technician B says that primary fuel filters are usually in the range of 20-25 microns. Who is correct?

Technician A says that the primary fuel filter is usually on the suction side of the transfer pump. Technician B says that the secondary fuel filter is usually on the suction side of the transfer pump. Who is correct?

How will a diesel engine perform when operating on fuel with a high cetane rating in the summer time?

A fuel pressure gauge test on an engine may indicate

The primary fuel filter on an engine is on the _____________ side of the fuel pump.

To determine if the fuel transfer pump for an injection system is operating efficiently, you must test for

Generally, with a mechanical fuel pump, motion is provided to the diaphragm by

All fuel lines in the vehicle that are attached to the frame or engine are made of specialized composite materials or

In a diaphragm type fuel transfer pump, the maximum possible output would be limited by

A fuel transfer pump

When you install a new or reconditioned plunger supply pump on an engine with a diesel injection system you must make sure that

As compared to a direct injection chamber, an engine equipped with pre-combustion chambers will

Some diesel engines have the fuel inlet and return lines cast as part of the cylinder head, while others have separate lines for inlet and return.

The lbs. of fuel consumed per brake horsepower per hour that is used by an engine, is known as

Rapidly and easily ignited diesel fuels would have a ____________ cetane rating.

The filter type that is removed and replaced as a complete filter unit is

The most commonly used diesel fuel in the equipment industry for the majority of the year, temperature permitting, is known as

A diesel fuel with a high viscosity rating

The cloud or wax point of a diesel fuel can be defined as

The centreline of a fuel storage tank should be mounted on a slight downward angle so that

1D fuel is best suited for summer use and has a higher BTU rating than 2D fuel.

Diesel fuel cetane rating indicates

Diesel contains the highest heat value of fuels used in internal combustion engines.

Octane refers to the fuels ability to

Volatility refers to the fuels ability to

Oxygen makes up approximately _______ % of the air.

Charles'' Law states that under constant pressure, the ____________ of a gas varies directly with its absolute temperature.

Boyle''s Law states that if the _______________ on a gas in a confined space is doubled, the gas will be compressed to half its original volume, provided the temperature remains the same.

The resistance of a liquid to flowing is called

Technician A says that you would require a fuel with a higher cetane rating when encountering lower engine temperatures when starting. Technician B says that the lower the ambient temperature, the greater the need for a fuel that will ignite rapidly. Who is correct?

The temperature at which fuel will no longer flow through a fuel line is known as

The temperature at which the wax in fuel separates is known as

The degree of filtration in a filter is measured in

What is cetane required to do as an additive?

Gasoline, diesel fuel, propane and natural gas are all derived from crude oil or petroleum and is made up of hydrogen and

There is a delay between the time that fuel is injected into the cylinder and the time that ignition by the hot air takes place. The duration of this delay is expressed as a(n) __________ number.

Fuel with a high sulphur content is likely to cause

Which of the following may cause a low power complaint?

On a fuel injection pump system, what is the purpose of the restricted fitting in the return fuel line at the outlet of the fuel pump?

What engine performance measurement is found by using the following formula: Torque x RPM divided by 5252?

An injector failure can occur because of

The fuel/water separator filter or sight glass should be drained

Excessive cylinder temperatures are the major cause of ___________ formation.

Fuel heaters should be thermostatically controlled because

The factor(s) that affect the ignition delay period are

Starting fluid should not be used in combination with engines which have

Contaminated or dirty fuel may cause

Diesel fuel conditioner will dissolve ice in the fuel tank.

Using winter fuel in the summer time may cause

Using summer fuel in the winter time may cause

Success!

Heavy-Duty Mechanic - Trucks & Equipment