Fuel Delivery and Air Induction: Description and Operation

DESCRIPTION - FUEL DELIVERY, GAS

The Fuel Delivery System consists of the following components:

- Fuel tank
- Fuel tank filler tube
- Tubes/lines/hoses
- Fuel rail

Fuel Tank





NOTE: Front Wheel Drive (FWD) fuel tank shown, All Wheel Drive (AWD) fuel tank similar.

The fuel tank is made from High Density Polyethylene (HDPE) material and is located near the rear center of the vehicle. The primary fuel pump module is located on the top left side of the fuel tank. All Wheel Drive (AWD) vehicles have a saddle style fuel tank that has a reservoir on both sides of the driveshaft and a secondary fuel pump module on the top right side of the fuel tank. The fuel tank contains the following components:

- Primary fuel pump module
- Secondary fuel pump module (AWD)
- Fuel tank vent (check valve)
- Control valve
- Inlet check valve

The primary and secondary (AWD) fuel pump modules are the only serviceable components of the fuel tank. If the fuel tank vent, control valve or inlet check valve requires service, the fuel tank must be replaced as an assembly.

The fuel tank vent, control valve and inlet check valve are components of the evaporative emissions system.

Primary Fuel Pump Module





The primary fuel pump module is mounted on the top of the fuel tank and contains the following components:

- Mounting flange
- Electric fuel pump
- Venturi jet pump (AWD)
- Fuel pump reservoir
- Inlet strainer
- Fuel pressure regulator
- Fuel level sending unit
- Fuel filter

The electric fuel pump (2) is a positive displacement, immersible pump with a permanent magnet electric motor capable of creating 860 kPa (125 psi) of operating pressure. The fuel pressure regulator limits fuel pressure to 400 kPa (58 psi).

If equipped with All Wheel Drive (AWD), the primary fuel pump module will also contain a venturi jet pump. The primary fuel pump module is joined to the secondary fuel pump module (AWD) by an internal nylon fuel transfer line equipped with quick-connect fittings (4). Fuel is constantly being siphoned from the secondary side of the fuel tank to the primary side of the fuel tank whenever the fuel pump is operating. This is accomplished within the primary fuel pump module by diverting fuel from the electric fuel pump through the venturi jet pump creating a vacuum that pulls fuel from the secondary fuel pump module through the fuel transfer line and into the primary fuel module reservoir. When the secondary side of the fuel tank is empty, the venturi jet pump continues to fill the primary fuel pump reservoir with fuel from the primary side of the fuel tank.

The fuel level sending unit (3) is the only serviceable component of the primary fuel pump module. If the electric fuel pump, fuel pressure regulator or fuel filter requires service, the primary fuel pump module must be replaced as an assembly.

Secondary Fuel Pump Module (AWD)





The secondary fuel pump module (AWD) is mounted on the top of the fuel tank and contains the following components:

- Mounting flange
- Fuel pick-up
- Fuel level sending unit

The secondary fuel pump module (AWD) does not pump fuel. It is joined to the primary fuel pump module by an internal nylon fuel transfer line (1) equipped with quick-connect fittings. Fuel is constantly being siphoned from the secondary side of the fuel tank to the primary side of the fuel tank whenever the fuel pump is operating.

The fuel level sending unit (2) on the secondary fuel pump module is not serviceable. If any component of the secondary fuel pump module requires service, the secondary fuel pump module must be replaced as an assembly.