GMC 12658552 Fuel Pump

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To remove the fuel pump/fuel level sensor, start by relieving the system fuel pressure and equalizing tank pressure by removing the fuel filler cap. Then, disconnect the cable from the negative battery terminal and proceed to remove the fuel tank. Next, disconnect the electrical connector, fuel supply line, and EVAP hoses from the fuel pump/fuel level sensor, making sure to soak up any spilled fuel with a shop rag. Mark the orientation of the fuel pump in relation to the fuel tank for proper realignment during installation. Using large water pump pliers, unscrew the fuel pump/fuel level sensor locknut counterclockwise. If the locknut is tight, use a hammer and brass punch to loosen it, avoiding steel punches that could produce sparks. Carefully remove the pump assembly, being mindful not to damage the fuel level sensor float arm and float. Before installing the pump, remember to replace the O-ring. The installation process is the reverse of the removal steps.

Remove the engine covers and the suspension cross brace. Relieve the fuel system pressure and disconnect the cable from the negative battery terminal. Remove the intake manifold and disconnect the low pressure feed line from the pump. The manufacturer states that any time the fuel lines are removed from the fuel pump or fuel rails they should be replaced. Using a flare-nut wrench, unscrew the high-pressure fuel line fittings. Raise the front of the vehicle and support it securely on jackstands. Disconnect the electrical connector from the high-pressure fuel pump. Working from under the vehicle, disconnect the fuel pump electrical connector. Remove the high-pressure fuel pump bolts and remove the pump. Always replace the bolts and O-ring. Loosen the bolts a little at a time until all of the spring pressure on the pump lifter is relieved to avoid damaging the pump or stripping the threads. With the pump removed, rotate the engine by hand and make sure the camshaft lobe for the pump's roller litter is at its base circle before trying to install the pump. Lubricate the pump roller lifter with engine oil and install the litter and gasket. Set the pump into the bore in the cylinder head and tighten the bolts evenly. As the pump bolts are tightened, it will get harder to tighten the bolts until the spring in the pump is compressed. Tighten the bolts to the torque. The remainder of installation is the reverse of removal. Clean the high-pressure fuel line fittings on the fuel rails, then apply a little clean engine oil to the threads. Install the new high-pressure fuel lines, tightening the fittings to the torque. Reconnect the cable to the negative battery terminal, then start the engine and check for fuel leaks.

To remove the high-pressure fuel pump, start by disconnecting the cable from the negative battery terminal and relieving the fuel system pressure. Then, disconnect the low-pressure feed line and use a flare nut wrench to unscrew the high-pressure fuel line fittings from the pump and fuel rail. Disconnect the electrical connector from the high-pressure fuel pump and remove the pump by unscrewing the bolts. Always replace the bolts and O-ring. Before installing the pump, make sure the camshaft lobe is at its base circle and lubricate the pump roller with engine oil. Install the gasket and bolts. To install the pump, set it into the cylinder head and tighten the bolts evenly to the proper torque specifications. The remaining steps involve reversing the removal process, including cleaning the high-pressure fuel line fittings, applying clean engine oil to the threads, and tightening the fittings to the correct torque specifications. Finally, reconnect the cable to the negative battery terminal, start the engine, and check for fuel leaks.

To remove the fuel pump module in this vehicle, start by disconnecting the cable from the negative battery terminal and relieving the fuel system pressure. Then, remove the fuel tank and disconnect the electrical and fuel supply line quick-connect fitting from the fuel pump module. Next, use a hammer and brass punch to rotate the lock ring counterclockwise and remove it. Carefully pull the fuel pump module out of the tank, angling it as necessary to protect the fuel level sensor float arm. To remove the fuel level sensor, push down on the retainer to release it, and then disengage the wiring terminals and replace the fuel level sensor. Finally, inspect the O-ring and replace it if necessary. The installation process is simply the reverse of the removal steps.

To disconnect the low-pressure feed line and high-pressure fuel line fittings, you can use a flare nut wrench to unscrew them from the pump and fuel rail.

Carefully pull the fuel pump module out of the tank, angling it as necessary to protect the fuel level sensor float arm.

After connecting the fuel pressure gauge, the engine should be started and the gauge reading should be compared to the proper pressure specifications.

For V6 engines, you need to reinstall the thermostat housing and refill the cooling system.

In electronic returnless fuel pumps, fuel pressure is regulated by a Fuel Pump Flow Control Module (FPFCM). There is no separate fuel pressure regulator in these systems.

To access the high-pressure fuel pump, you need to remove the cowl panel and the wiper motor and linkage. Additionally, you should remove the high-pressure fuel pump line shield fasteners and the shield. If more working space is needed, the intake manifold and both fuel rails may also be removed.

No, these components cannot be serviced separately.

Remove the fuel tank and disconnect the electrical and fuel supply line quick-connect fitting from the fuel pump module.

Before installing the pump, you should ensure that the camshaft lobe is at its base circle and lubricate the pump roller with engine oil.