Fuel Tank and Lines

Fuel Tank and Lines


Gasoline Engines

The gasoline fuel system contains:

- a fuel tank. There are 3 available:
- a midship fuel tank (mounted to the LH frame side rail).
- an auxiliary fuel tank (mounted to the LH frame side rail).
- an aft-of-axle fuel tank (mounted between the side rails).

- a fuel tank filler pipe which contains a restrictor plate to permit only unleaded fuel to be pumped into the fuel tank.
- a one-fourth turn fuel tank filler cap.
- a fuel filter providing filtration to protect the fuel injectors.
- fuel and vapor tubes.
- a fuel rail-mounted fuel pressure and temperature sensor.
- a Fuel Pump (FP) which provides pressurized fuel to the engine and has:
- a serviceable fuel sender.
- an inlet filter.
- a check valve which maintains system pressure after the FP is shut off.
- a pressure relief valve for overpressure protection in the event of restricted flow.

- an Inertia Fuel Shutoff (IFS) switch
- a Fuel Pump Driver Module (FPDM)

The fuel tank stores the liquid fuel. Electrical power to the FP is provided through the IFS switch. The fuel pump module is controlled by the PCM through the FPDM. The fuel pump provides fuel to the fuel rail through the fuel supply tube. Vapor tubes route fuel vapor to the Evaporative Emission (EVAP) canister and the intake manifold through the EVAP canister purge valve.


Diesel Engines

The diesel fuel system contains:

- a fuel tank. There are 3 available:
- a midship fuel tank (mounted to the LH frame side rail).
- an auxiliary fuel tank (mounted to the LH frame side rail).
- an aft-of-axle fuel tank (mounted at the rear of the frame between the side rails).

- a fuel tank filler pipe without a restrictor plate.
- fuel tubes.
- a one-fourth turn fuel tank filler cap (green for ultra low sulfur diesel).
- a fuel conditioning module that:
- has a fuel filter and water separator to protect the fuel injectors.
- has an in-line FP which provides pressurized fuel to the engine and contains a pressure relief valve for overpressure protection in the event of restricted flow.
- is frame mounted.

- the fuel tank selector valve.
- frame-mounted in-line valve, electronically controlled by a switch, which allows fuel to be drawn from either fuel tank.

- an IFS switch
- a vapor tube (midship fuel tank)

The fuel tank stores the liquid fuel. The FP, located in the fuel conditioning module is controlled by the FP PCM. Electrical power to the FP is provided through the IFS switch. The fuel supply tubes route fuel from the fuel tank to the engine and the fuel return tubes route unused fuel from the engine back to the fuel tank.