Cadillac 12691016 Pump Assembly, Fuel

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To remove the fuel pump, begin by relieving the fuel system pressure and disconnecting the negative battery terminal cable. Drain the cooling system and remove the thermostat housing. Disconnect the electrical connector and low-pressure fuel line from the pump. Use a wrench to unscrew the fuel line fittings from the pump and fuel rail.

The vehicle has two fuel pump modules. The primary module includes the fuel pump, fuel level sender, and filter. The secondary module has a fuel level sender and fuel pick up. These parts can't be serviced separately. The Fuel Pump Driver Module (FPDM) regulates fuel pressure. To remove the primary module, relieve fuel pressure, disconnect the electrical connector and fuel line, rotate the locking ring counterclockwise, and pull the module out. Check and replace the O-ring if needed. The secondary module removal process is similar. The FPDM is behind the right-rear quarter trim panel. Access it by removing the rear seat and panel, disconnect the connector, and remove the mounting nut. Reinstall in reverse order.

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.

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.

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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