GM 30026422 Fuel Pump Assembly (On Esn)

Disconnect the cable from the negative terminal of the battery and relieve the fuel system pressure. For mechanical pumps in carbureted vehicles, relieve the fuel tank pressure by removing the fuel filler cap, then locate the fuel pump mounted on the right rear corner of the cylinder head. Place rags underneath the pump to catch any spilled fuel, loosen the hose clamps, and disconnect the hoses using a twisting motion while plugging them immediately to prevent leakage and dirt entry. Unscrew the fasteners retaining the pump to the cylinder head, detach the pump, and inspect the pump pushrod for wear, replacing it if necessary and coating it with clean engine oil before installation. Remove all traces of old gasket material from the mating surfaces on the cylinder head and the fuel pump if it will be reinstalled, taking care not to gouge the soft aluminum surfaces. Installation is the reverse of removal, ensuring a new gasket is used and the mounting fasteners are tightened to the specified torque. For electric pumps in fuel-injected vehicles, remove the fuel tank and unscrew the six bolts securing the fuel pump flange, then lift the assembly out of the fuel tank. Remove the pump from its bracket, disconnect the electrical connectors while noting their positions, and push the nozzle of the new pump into the coupling hose before inserting the bottom of the pump into its bracket and connecting the wires to the proper terminals. If the filter at the bottom of the pump appears dirty, replace it, and complete the installation by reversing the removal process, ensuring to replace the pump unit sealing O-ring if it shows any signs of deterioration.

For carbureted vehicles, raise the vehicle securely and, with the engine running, inspect all fuel lines for leaks, loose connections, kinks, or flattening in the rubber hoses quickly before the engine heats up.