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94-99 GM 6.5L Turbo Diesel Fuel Transfer Pump

Fuel Transfer Lift Pump

Alliant Power part number: AP63440. Replaces AC Delco: EP309

Flow spec is 2PSI at 13.5 volts and 23GPH.

OEM Part Numbers: 25117340

Year Range: Engine:

1994-1999 6.5 L

Common lift pump failure symptoms include slightly harder starting and low power.

This pump is under the driver's side seat inside the frame rail. You should be able to feel the pump vibrate while the engine is running. If it isn't, first check to see that the pump is receiving 12 volt power while the engine is on.

If there is not 12 volt power to the injection pump, the next thing to check is the oil pressure sensor switch on the engine. Commonly, these switches fail and in turn don't send a power signal to the lift pump. 

Continuing to operate with a failed lift pump can cause overheating and eventual failure of the injection pump and PMD (if you have not upgraded to a remote mount PMD).

NOTE: This pump Will NOT fit an H1 Hummer.

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