GM 12691016 Pump Assembly, Fuel

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If the fuel pressure is too low, there may be a restriction in the fuel system, such as a faulty fuel inlet strainer or a blockage in the fuel line.

To remove the fuel pump, start by relieving the fuel system pressure and disconnecting the cable from the negative battery terminal. If you have a V6 engine, drain the cooling system and remove the thermostat housing. Disconnect the electrical connector and low-pressure fuel line from the pump. Use a flare nut wrench to unscrew the high-pressure fuel line fittings from the pump and fuel rail. Remove the high-pressure fuel pump mounting bolts and the pump itself, replacing the bolts and O-ring with new ones. Before installing the pump, make sure the camshaft lobe is at its base circle. To install the pump, lubricate the pump roller and insert it into its bore. Insert the new bolts through the pump holes and install the gasket to hold the bolts in place. Set the pump into the cylinder head and tighten the bolts evenly to the correct torque specifications. The rest of the installation process involves reversing the removal steps, including cleaning and applying clean engine oil to the high-pressure fuel line fittings on the fuel rails. For V6 engines, reinstall the thermostat housing and refill the cooling system. Finally, reconnect the cable to the negative battery terminal, start the engine, and check for any leaks.

Start by relieving the system fuel pressure and equalizing tank pressure by removing the fuel filler cap.

In electronic returnless fuel pumps, fuel pressure is regulated by a Fuel Pump Flow Control Module (FPFCM). There is no separate fuel pressure regulator in these systems.

After removing the high-pressure fuel pump, it is recommended to always replace the bolts and O-ring.

The low pressure feed line from the pump should be disconnected.

The final step is to remove the fuel pump mounting bolts and discard the pump.

There are two fuel pump modules in the vehicle. The primary module consists of the fuel pump, fuel level sending unit, and fuel filter. The secondary module includes a fuel level sending unit and fuel pick up. These components cannot be serviced separately. The fuel pressure is regulated by the Fuel Pump Driver Module (FPDM). To remove the primary module, relieve the fuel system pressure and disconnect the electrical connector and fuel supply line quick-connect fitting. Rotate the locking ring counterclockwise using pliers and carefully pull the module out of the tank, disconnecting the transfer tube. Inspect and replace the O-ring if necessary before reinstalling. For the secondary module, disconnect the electrical connector and rotate the locking ring counterclockwise to remove it. Carefully pull the module out of the tank, disconnecting the transfer tube. Inspect and replace the O-ring as needed before reinstalling. The FPDM, which controls the fuel pump module speed and pressure, is located behind the right-rear quarter trim panel. To access it, remove the rear seat and right-rear quarter trim panel. Disconnect the electrical connector and remove the mounting nut to remove the FPDM. Reinstallation is the reverse of removal.

The tangs of the module lock ring should be sprayed with penetrating oil, and then water pump pliers can be used to remove the lock ring. If it's stuck, tapping it with a hammer and brass punch may be necessary.

Before installation, the o-ring should be inspected and replaced if deteriorated. Then, the module can be installed by reversing the removal process.

After completing those steps, you should loosen the fuel line fittings and disconnect the flexible fuel line and metal fuel lines from the high-pressure pump.

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