GM 12641847 Fuel Pump Assembly

The fuel pump check involves listening for the whirring sound made by the fuel pump when the ignition key is turned ON. If the pump does not come on, check the fuel pump fuse, relay, and wiring. If they all work, the fuel pump is likely defective. If the pump runs continuously, the PCM may be defective. Begin the engine and the gauge reading is compared to the proper pressure specifications. If the pressure is too low, there may be a faulty fuel inlet strainer or blockage in the fuel lines. If it is too high, replace the regulator. The key to the engine must be in the OFF position when checking the psi level. Any fuel leaks should be checked for and the system should be cleaned up.

To remove the high-pressure fuel pump, begin by relieving fuel pressure and disconnecting its electrical connector. Remove intake air ducting for access. Remove the thermostat housing. Disconnect fuel lines at the injector rail and high-pressure pump. Remove the pump mounting bolts and the pump itself. Installation is the reverse of removal. Check for fuel leaks upon starting the engine.

Mark the orientation of the fuel pump in relation to the fuel tank for proper realignment during installation.

Remove the high-pressure fuel pump mounting bolts and the pump itself, replacing the bolts and O-ring with new ones.

After disconnecting the electrical connector, you should disconnect the intake air ducting and, if applicable, remove the thermostat housing.

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

The pump roller should be lubricated with camshaft installation lubricant or clean engine oil before installation.

Disconnect the electrical connector, fuel supply line, and EVAP hoses from the fuel pump/module.

To remove the primary fuel tank module, all electrical connectors from the module and pressure sensor should be disconnected.

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