Exam 29: Fuel Delivery Systems

When draining a fuel tank, Technician A drains the fuel into plastic antifreeze containers then caps them tightly to prevent leaks. Technician B drains the fuel into approved gasoline storage containers. Who is correct?

A loose gas cap cannot cause the MIL light to turn on.

A loss of residual fuel pressure immediately after engine shutdown could cause ______.

A vehicle with a leaking nylon fuel supply line is being repaired. Technician A says replace the nylon fuel line with a section of double-wall steel fuel line, using short lengths of rubber fuel hose and screw clamps to connect to the filter and fuel tank to the steel line. Technician B says use an OEM nylon fuel line assembly. Who is correct?

Some vehicles have two fuel pumps: an in-tank pump and a second pump mounted under the vehicle.

The first step in removing a fuel tank is to ______.

During its evaporative system integrity test, the canister vent solenoid is open to vent the entire evaporative system.

What is the purpose of the pump check valve?

All quick-disconnect fuel line fittings are hand releasable and do not require special tools to disconnect.

Technician A says the gas cap is equipped with a pressure release valve that opens if there is excess vapor pressure in the fuel tank. This prevents tank ballooning. Technician B says the gas cap is equipped with a vacuum relief valve that opens if there is an excessive amount of vacuum in the fuel tank. This prevents tank collapse. Who is correct?

Fuel lines are being discussed. Technician A says when installing flexible tubing, always use new clamps. Technician B says ordinary rubber hose may be used to replace a kinked steel fuel line. Who is correct?

A vehicle is being diagnosed with a low fuel pressure problem. A fuel pump current test reveals higher than normal current flow. Technician A says the vehicle may have a clogged fuel filter. Technician B says the fuel pump ground wire may be loose or corroded. Who is correct?

Name three situations where the PCM automatically turns off the fuel pump.

The arrow printed on a fuel filter must face in what direction?

What materials are fuel lines normally made from?

In Chrysler EFI systems, the ASD relay [automatic shutdown] controls the power to the ______.

A scan tool can be used to turn on the fuel pump when the engine is not running.

Copper tubing can be used to replace steel tubing for fuel lines.

Fuel pressure readings are being discussed. Technician A says high fuel pressure can be caused by a defective pressure regulator. Technician B says low fuel pressure can be caused by a defective pressure regulator. Who is correct?

What is the first step in removing a fuel tank from a vehicle?