GMC 12673824 Sensor Assembly, Fuel Injection Fuel Rail Fuel Pressure

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The fuel pressure sensor is located under the vehicle, on the fuel supply line. To replace it, first relieve the system fuel pressure. Then, raise the vehicle and support it securely on jackstands. Disconnect the electrical connector from the fuel pressure sensor by depressing the release tab. To remove the sensor from the fuel supply line, hold the flats on the fuel line with a wrench to prevent twisting the line, then unscrew the sensor. Unscrew the fuel pressure sensor from the fuel supply line. Remove and discard the old fuel pressure sensor O-ring. Coat a new O-ring with a little clean engine oil, then install it on the fuel pressure sensor. Installation is otherwise the reverse of removal. Be sure to tighten the fuel pressure sensor securely. Before lowering the vehicle, test for leaks by turning the ignition switch key to the ON position (don't start the engine) for two seconds, then to the OFF position for ten seconds, then back to the ON position. Inspect the area around the fuel pressure sensor for leaks. The Fuel Pump Driver Module (FPDM), also referred to as the Fuel Pump Power Control Module, is located under the vehicle, above the spare tire. Remove the spare tire from the vehicle. Raise the rear of the vehicle and support it securely on jackstands. Remove the spare tire. Disconnect the electrical connector from the FPDM. Remove the FPDM mounting bolts and remove the module from its mounting bracket. Installation is the reverse of removal.

You should tighten the high-pressure fuel pump bolts evenly, one turn at a time, from side to side.