How to Replace a Fuel Pump in a GMC Sierra

The GMC Sierra has an electric fuel pump so you should ensure that its fuses and relays are working before checking it. You may need to clean your fuel pump or replace it if your gas tank is not empty, but your vehicle has difficulty getting fuel. The GMC Sierra comes in a variety of styles and trim levels that can affect the replacement fuel pump you choose.

Instructions

1

Determine which fuel pump your GMC Sierra will need. This depends not only on the make and model, but also the engine size. Models are equipped with a Vortec 4.3 L, 4.8 L, 5.3 L or 6.0 L engine, depending on the exact model.

2

Use a socket wrench to disconnect the negative battery cable. Relieve the fuel system pressure, drain and remove the fuel tank. Use a fuel tank sending unit wrench to remove the retaining ring for the fuel sender assembly and discard the seal.

3

Note the position of the fuel strainer before pulling it off and discarding it. Unplug the electrical connection for the fuel pump and the fuel level sensor under the cover of the fuel sender.

4

Remove the retaining clip for the fuel level sensor and remove the fuel level sensor by squeezing the locking tangs. You may now remove the fuel pressure sensor.

5

Install the new fuel pump using the items included in the kit, especially the seal and fuel strainer. Tighten the mounting bolts for the fuel tank straps 30 foot pounds.

6

Complete the installation by reversing the removal procedure. Turn the ignition on for 2 seconds, off for 10 seconds and start the engine to check for leaks.