Fuel Tank: Description and Operation

Fuel Tank, Pump, And Related Components:

FUEL TANK
The fuel tank is located under the rear of the vehicle and is the fuel reservoir. The tank has a vertical baffle installed to support the filler tube and to serve as a slosh baffle. The fuel pump and fuel level sending unit assembly are mounted in the fuel tank as one assembly. The fuel tank assembly also consists of the fuel filler neck and filler cap.

FUEL FILLER NECK
To help prevent refueling with leaded fuel, the fuel filler neck has a built-in restrictor and deflector. The opening of the restrictor will accept only the smaller unleaded gasoline nozzle which must be fully inserted to bypass the deflector. Attempted refueling with a leaded fuel nozzle will result in fuel splashing back out of the filler neck.

FUEL TANK FILLER CAP
The fuel tank filler neck is equipped with a screw type cap. The threaded part of the cap requires several turns counterclockwise to remove. The long threaded area was designed to allow any remaining fuel tank pressure to escape during cap removal. A ratchet type torque limiting device prevents over-tightening. To install, turn the cap clockwise until a clicking noise is heard. This signals that the correct torque has been reached and the cap is fully seated.

NOTE: If a fuel filler cap requires replacement, only a cap with the same features should be used. Failure to use the correct cap can result in a serious malfunction of the system.

FUEL AND VAPOR PIPES
The fuel feed and return pipes extend from the fuel pump/gauge sending unit to the engine compartment. The pipes are secured to the underbody with clip and screw assemblies. Both fuel feed pipes and return pipe must be properly routed and retained, and should be inspected occasionally for leaks, kinks, or dents. If evidence of dirt is found in the fuel rail/injector assembly or fuel filter during disassembly, the pipes should be disconnected and blown out. Check the fuel strainer on the fuel pump/fuel gauge assembly for damage or omission.

The vapor pipe extends from the fuel pump/gauge assembly to the charcoal canister. The purge hose then goes from the canister to the engine.

Due to the fact that the fuel pipes/hoses are under high pressure on fuel injected systems these systems require the pressure be relieved before servicing.

FUEL LINE "O" RINGS
The fuel line "O" rings used are made of Viton. They are brown in color. Viton is less affected than rubber by the additives used in many fuels. Therefore, rubber should not be used.