Exam 29: Fuel Delivery Systems

All fuel tank fittings are the threaded type.

If the fuel system does not have a test port, how can you safely relieve residual fuel pressure?

What materials are fuel lines normally made from?

All current gasoline fuel tank filler tubes have a built-in restrictor that prevents the entry of the larger leaded fuel delivery nozzle at gas pumps.

Fuel line fittings are being discussed. Technician A says that O-rings are used on some fuel line fittings. Technician B says that clamps are used on some systems. Who is correct?

Residual fuel pressure is being discussed. Technician A says remove the fuel filter hose and apply compressed air to the fuel line to push the residual fuel back into the fuel tank. Technician B says to relieve the residual pressure by connecting a fuel gauge with a bleed valve to the Shrader valve. Who is correct?

When emptying 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?

Some states mandate a gas cap check as part of the annual emissions tests.

Fuel tanks may be constructed of all the following EXCEPT:

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

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?

An in-tank electric pump is usually the ____________________ type.

A plugged fuel filter will cause ______.

What is the purpose of the pump check valve?

The fuel strainer is sometimes referred to as a ____________________.

Technician A says on some vehicles the fuel pressure is monitored by a fuel rail pressure sensor and the output of the fuel pump is controlled by the PCM through pulse-width modulation. Technician B says all fuel pumps on late-model vehicles are controlled by the PCM according to inputs received on the CAN bus and other specific sensors.Who is correct?

If twenty inches of vacuum is applied to the fuel pressure regulator while the fuel pump is running, the fuel pressure should ____________________  .

In a returnless system, the pressure regulator is in the fuel tank and excess fuel is released to the tank.

On modern vehicles, the fuel pump is shut off when the air bag is deployed.

Quick-disconnect fuel line fittings are sealed by a(n)____________________ inside the female connector.