Home » GM 6.5 » GM/Detroit 6.5L ENGINE CONTROLS – Fuel Lift Pump Replacement

GM/Detroit 6.5L ENGINE CONTROLS – Fuel Lift Pump Replacement

Removal Procedure
Caution: To reduce the risk o f fire and personal injury that may result from a fuel leak, always replace O-ring seals exposed during component services.
Caution: Refer to Battery Disconnect Caution in Cautions and Notices.
1. Remove negative battery cable(s).
2. Loosen filler cap(s) to relieve tank pressure.
3. Release the fuel pump electrical connector.

4. Clean both fuel line connections and surrounding areas at fuel pump before disconnecting to avoid possible contamination of the fuel system.
5. Remove both fuel lines from fuel pump by loosening the fuel line fittings.

6. Slide fuel pump out of bracket.

Installation Procedure
1. Position the new pump in the pump bracket.

Notice: Refer to Fastener Notice in Cautions and Notices.
2. Install both fuel lines on the fuel pump.
Use a backup wrench in order to prevent the pump from turning. Tighten the fuel line fittings to 30 N-m (22 lb ft).

3. Connect the fuel pump electrical harness connector.
4. Connect the negative battery cables.
5. Tighten the fuel tank filler cap(s).
6. Bleed the air from the system.
7. Start the engine and check for leaks.


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