Fuel Pump Module Operation

All 7.4L and some 5.7L engines use a fuel module to correct vapor lock (hot restart) during high ambient temperature conditions. The module overrides the ECM 2-second pump operation and will run the fuel pump for 20 seconds when ignition is first turned on.

An inoperative fuel module may cause a hot stall/no start condition. Check for power and ground circuit to fuel module and check complete circuit to pump from terminal "A". If okay, and pump does not run for the specified 20 seconds when ignition is first turned on, replace the fuel module.