GM 88974776 Fuel Tank Fuel Pump Module(Sender & Pump & Regulator)

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To check fuel pressure, remove the fuel line after relieving system pressure, turn on the ignition, and check the gauge. If pressure isn't within specifications, check the fuel pressure regulator or other causes. You can inspect the EFI fuse and wiring to the pump.

Check on the availability of parts before disassembling the unit. Relieve the fuel system pressure. Disconnect the cable from the negative terminal of the battery. Remove the fuel tank cap. Remove the rear seat from inside the passenger compartment. Remove the fuel pump/sending unit access cover. Unplug the electrical connectors, then disconnect the fuel lines. On 2003 and 2004 models, remove the fuel pump/sending unit retaining screws and remove the mounting flange. In 2005 and later models, the fuel pump assembly is retained in the tank by a large screw-on ring. A special tool is available which makes loosening and tightening this ring very easy, but a large pair of water pump pliers will work. Carefully withdraw the fuel pump/fuel level sending unit assembly from the fuel tank. The components of the fuel pump assembly are modular and all attach to the main housing. Remove the plastic support on the bottom of the pump by releasing the clips with a screwdriver, the pull off the rubber isolator, the fuel sock filter clip, then the electrical connector. Withdraw the pump from the housing. Inspect the strainer for contamination. If it is dirty, replace it. Reassemble the fuel pump/sending unit in the reverse order of disassembly. Install the fuel pump/sending unit assembly in the fuel tank. When installing the fuel pump assembly locking ring 2005 and later models, the raised rib on the ring should align between the two triangle marks on the tank, and the four prongs should be in their notches. Connect the fuel line and electrical connectors. The remainder of installation is the reverse of removal.