Exam 29: Fuel Delivery Systems

How can you tell whether the fuel pump runs when the ignition switch is turned on?

If a vehicle is to be stored for several months, a fuel ____________________ should be added to the gasoline in the fuel tank.

Technician A connects a fuel pressure gauge to the Schrader valve on the fuel rail. Technician B connects the gauge to the fuel lines by inserting a tee adapter between the fuel filter and the fuel rail. Who is correct?

Technician A says the best method for permanently solving a leaking metal fuel tank is to replace the tank. Technician B says a leaking plastic fuel tank can sometimes be repaired. Who is correct?

A vehicle has been 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?

On many vehicles, the ____________________ must be removed to replace the fuel pump.

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

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

The negative battery cable should be disconnected before working on the fuel system.

A fuel pressure test reveals higher than normal fuel pressure. Describe the steps you would take to determine the root cause of the problem.

Where in the fuel system is a fuel filter usually found?

The fuel filter on a modern car is typically mounted ______.

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

Fuel tank vapors are vented through the fuel filler cap.

Technician A says a pressure relief valve closes if the fuel supply line is restricted and pump pressure becomes very high. Technician B says the check valve in the pump prevents fuel from draining out of the fuel system and back into the fuel tank. This helps holds residual pressure in the fuel lines after the pump is turned off. Who is correct?

Where is the fuel pressure regulator on a returnless fuel system?

What class of fire extinguisher should be used on gasoline fires?

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

A pressure ____________________ can be used to connect a DMM (or lab scope)to the fuel system to measure fuel pressure.

On a GM vehicle, a defective fuel pump relay will prevent the engine from running.