Exam 29: Fuel Delivery Systems

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

A fuel pressure test reveals higher than normal fuel pressure. How would you determine the root cause of the problem?

A restricted fuel filter will cause ____________________ than normal fuel pressure.

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

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

A(n) ____________________ switch shuts off the fuel pump if the vehicle in involved in a collision or rolls over.

On a modern common rail diesel (DI) direct injection system fuel pressure is typically ______ psi.

Fuel tank vapors are vented through the fuel filler cap.

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

Fuel pumps should be tested for ____________________ and ____________________.

Technician A says a pressure relief valve opens 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?

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

The fuel pump check valve is normally located in the fuel rail.

A high fuel pressure reading is typically caused by a faulty fuel ______.

A plugged fuel filter will cause ______.

Which of the following is a typical fuel filter replacement interval?

All modern vehicles use a threaded, removable gas cap.

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?

All modern fuel tanks can only be filled to 90 percent of their capacity.

All fuel tanks have a liquid vapor separator.