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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Engine Controls - Theory & Operation - 3.3L Gasoline) >> Fuel System >> Fuel Delivery >> In-Tank Fuel Pump (MFI)

In-Tank Fuel Pump (MFI)

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.

Fuel pump is located in fuel pump module. Fuel pump module is located in top of fuel tank. Fuel pump module includes a combination fuel filter/fuel pressure regulator, fuel pump reservoir, a separate in-tank fuel filter, pressure relief/rollover valve, fuel gauge sending unit, and fuel supply line. On 5.9L HD and 8.0L engines and all cab-chassis models, an auxiliary (capped) non-pressurized fuel supply fitting is located on top of fuel module.

Fuel pump is a positive displacement, immersible pump with a permanent magnet electric motor. Fuel is drawn in through a separate filter at bottom of fuel pump module and pushed through electric motor to fuel filter/fuel pressure regulator. Voltage to operate pump is supplied from fuel pump relay controlled by ASD relay. Fuel pump is not serviceable. If fuel pump is faulty, fuel pump module must be replaced.