How to Change a Silverado Fuel Pump

Bad fuel pumps are not something to take lightly. Aside from reducing gas mileage, a failing fuel pump can leave you stranded without notice. If your fuel pump is on the verge of going out, follow this easy guide to replace your Silverado’s fuel pump immediately.

Tools Required

  • 2-ton+ floor jack and jack stands
  • Fuel siphoning kit
  • Catch can/pan for fuel
  • Allen wrench or ratchet
  • Transmission jack (if available)
  • Channel locks
  • Fuel line separator

Silverado Fuel Pump

Removal Procedure

1. Loosen the gas cap to relieve pressure from the gas tank, and then remove the fuel pump relay from the fuse box.

2. Start your Silverado with the gas cap off, and let it run until it stalls. This will completely relieve the pressure from within the gas tank and fuel system.

3. Disconnect the negative battery cable from the battery, and place it in a safe location where it cannot come into contact with the battery.

4. Siphon fuel from the gas tank into your catch can/pan.

5. Raise the rear end of your Silverado using your floor jack and place it on jack stands.

6. Once your Silverado is in the air, use your Allen wrench to remove the flange mounting screws for the gas cap door, and remove the gas tank shield and the filler neck’s ground strap.

7. Remove the EVAP canister from the front of the gas tank by disconnecting the three lines from the canister and removing the bracket-mounting bolt.

8. Once removed, disconnect the fuel supply and return lines from the front of the tank by pressing the retaining clips for the plastic quick-connect fittings while using your fuel line separator tool on the metal fittings.

Notice: Be careful when disconnecting the lines as they may have some pressure remaining in the system. Have your catch can/pan ready, as fuel will more than likely drain once disconnected.

9. Support the gas tank by raising a jack underneath it, then unbolt the two strap bolts from the fender side of the tank and lower the tank.

10. Disconnect the wiring harness to the fuel pump. They can be reached through the wheel well. Disconnect the filler hose from the tank by loosening the clamps, and then completely remove the gas tank.

11. Disconnect the EVAP and fuel lines from the pump module located on top of the gas tank. Release the locking tab on the retaining ring while rotating the ring counter-clockwise with your channel locks. Once released, remove the assembly from the gas tank.

Installation Procedure

1. Ensure the surface of the gas tank is clean, and the new pump assembly has a new seal.

2. As you install the new assembly, ensure the fuel line fittings are aligned with the fuel lines.

3. Apply pressure to the new assembly in the gas tank to ensure it seals properly.

4. Apply the retaining ring and ensure it’s completely sealed, and the locking tab is within the ring’s slot.

5. Install the gas tank back to its appropriate place using removal procedure in reverse order.

6. Once in place, reconnect the fuel pump relay to the fuse box and tighten the gas cap.

7. Re-pressurize your Silverado’s fuel system by turning the ignition on for two seconds, then shutting it off between five to ten seconds. Repeat this five to 10 times to ensure your system is fully pressurized.

Way to go! You’re all finished!