AUT108 Fuel Management Systems

A high percentage of oxygen may mean _________.

• Too little fuel is entering the engine

• The mixture is too lean

• Lambda is greater than 1

• All of the above

Tech A states that an engine can burn liquid fuel efficiently to produce power. Tech B states that the liquid fuel must be vaporized fully before it can be ignited. Who is correct?

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Atmospheric pressure is _____ psi at sea level.

• 21

• 10.7

• 14.7

• 687

All of these are advantages of electronically controlled fuel injection over mechanical injection systems EXCEPT:

• continuous air fuel adjustments are possible.

• reduced emissions are achieved

• fuel can be delivered in a continuous stream.

• reduced fuel consumption is achieved.

Types of fuel line connections include all of these EXCEPT:

• banjo bolt fittings.

• quick couplings.

• flare fittings.

• compression fittings.

The pressure between the pump and the injectors can be maintained by _________.

• Varying the speed of the pump

• Input from the driver

• Both A and B

• None of the above

The ________ design uses a one-way valve to hold pressure in the system while the pressure tester is connected and disconnected to the fuel rail.

• O-ring valve

• Quick-connect valve

• Schrader valve

• Fuel pressure tester valve

The ______ can also prevent small amounts of water from getting past it because the paper absorbs the water, causing the fibers in the filter to swell.

• Plastic filter

• Fine mesh filter

• Paper filter

• None of the above

Sequential injection means injection occurs in the sequence of the firing order.

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Which of the following is NOT one of the three basic EFI systems?

• Throttle body injection

• Multipoint fuel injection

• Computer-controlled carburetor injection

• Gasoline direct injection