FuelPump Relay Issues. Another potential cause for bad fuel pump symptoms is a faulty fuel pump relay. This relay controls the power supply to your Ram's fuel pump, and a faulty relay may lead to: Intermittent power loss to the fuel pump; Inability to start your truck; Unpredictable pump operation, leading to stalling or rough running Lookfor a failing fuel pump relay, bad connections or broken wiring. The fuel pump relay is located under the Mass Air Meter on Fox bodied stangs built after 91. On earlier model cars is under the passenger seat. On Mass Air Conversions, the signal lead that tells the computer that the fuel pump has power may not have been wired correctly. Any6.0L F-Super Duty truck: The fuel pump relay is located inside the instrument panel relay box. This means it is integral to the box and you will need to replace the fuse box if the relay fails. The "DRIVER" is an electrical ground inside the PCM. If you want fuse info, circuit colors and locations, you will need to be more specific. FuelPump Relay, Powertrain Control Module: 18- -19: 7.5: Remote Controlled Mirror (Mirror Heater) 20: 7.5: A/C Compressor Clutch Relay, A/C-ECU, Blower Relay, Condenser Fan Motor, Fan Control Relay, Front-ECU, Heated Seat Relay, Outside/Inside Air Selection Damper Control Motor, Radiator Fan Relay, Rear Window Defogger Relay: Vay Tiền Nhanh Chỉ Cần Cmnd Nợ Xấu.

when a fuel pump relay is bad