Fuel Pump

The electric fuel delivery system used on the 4.9L, 5.0L, 5.8L and 7.5L multiport fuel injection (MFI) engines (6007) consists of a fuel delivery module (FDM) and sending unit. The fuel delivery module includes a high-pressure fuel pump (9350), venturi jet pump, supply check valve, and a shuttle selector valve located internally to a reservoir mounted from the fuel tank sender flange.

Fuel Pump Assembly

Item	Part Number	Description
1	—	Fuel Delivery Module (Part of 9H307)
2	—	In-Tank Venturi Filter (Part of 9H307)
3	9A299	Resistor Assembly (Part of 9H307)
4	—	High-Pressure Pump (Part of 9H307)

The following provides a brief description and function of each of the fuel delivery module internal components.

The high-pressure fuel pump is located inside the module.

The shuttle selector valve opens the return tube to the tank and the return flow is directed to the appropriate tank on vehicles equipped with dual tanks.

The supply check valve, which is normally closed, opens when the outlet pressure from the energized pump exceeds the opposing check valve spring force. When the fuel pump is de-energized (i.e., engine is shut off), the supply check valve closes to maintain pump prime and fuel supply tube pressure.

A portion of the high-pressure flow from the fuel pump is diverted to operate the venturi jet pump. The venturi-type fuel pump draws fuel from the fuel tank (9002) into the fuel delivery module reservoir to augment the engine return flow. This process ensures an adequate fuel supply to the fuel pump during extreme vehicle maneuvers and steep vehicle altitudes with low-tank fill levels.

The inlet of the venturi pump has a nylon filter on it to prevent dirt and other particulate matter from entering the system. Water in the fuel tank can pass through the filter without restriction.

Item	Part Number	Description
1	—	Fuel Delivery Module (Part of 9H307)
2	—	Supply Check Valve (Part of 9H307)
3	—	Venturi Filter Screen (Part of 9H307)
4	—	Pump Filter Screen (Part of 9H307)

The in-tank mounted fuel delivery module containing the fuel pump is capable of supplying 105 liters (27.7 gallons) of fuel per hour at a working pressure of 270.0 kPa (39 psi) for the 5.0L, 5.8L and 7.5L MFI engines. The fuel delivery module can supply 90 liters (23.7 gallons) per hour at 380 kPa (55 psi) for the 4.9L SFI engine. The fuel pump has an internal pressure relief valve to provide over-pressure protection in the event the fuel flow becomes restricted. Over-pressure is restricted to 850 kPa (123 psi) and reduced fuel flow will result. The system pressure is controlled by a fuel pressure regulator (9C968) on the engine.