Cadillac 12658486 Fuel Pump Assembly

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

There are two fuel pump modules. The primary module includes the fuel pump, a fuel level sending unit, a fuel filter and, on mechanical returnless pumps, a fuel pressure regulator. The secondary module includes a fuel level sending unit and the fuel pick up. On electronic returnless pumps, there is no regulator; fuel pressure is regulated by a Fuel Pump Flow Control Module (FPFCM). None of these components are separately serviceable. First, relieve the fuel system pressure. Disconnect the cable from the negative battery terminal. Then, remove the fuel tank. Disconnect the electrical connector and the fuel supply line quick-connect fitting from the fuel pump module. Using pliers against the locking ring and the module, rotate the lock ring counterclockwise to remove it. Carefully pull the fuel pump module out of the tank and disconnect the transfer tube that connects the modules. Angle it as necessary to protect the fuel level sensor float arm and remove it from the tank. Inspect the O-ring and replace it if it shows any sign of deterioration. Installation is the reverse of removal. On vehicles equipped with an electronic returnless fuel system, the fuel pump module speed, and therefore the output and pressure, is controlled by the FPFCM, which is located in the left rear part of the trunk/luggage compartment. On sedan and coupe models, remove the carpet trim from the left rear part of the trunk. On wagon models, remove the rear floor storage compartment. Disconnect the electrical connector from the FPFCM. Remove the pin-type retainers and remove the FPFCM. Installation is the reverse of removal.