1986 Dodge Ram 150 Fuel Pump No Power

Suggested Repair

Confirm the ignition switch is supplying power to the auto shutdown relay, then check that power continues from that relay to the fuel pump relay, which is likely on the same bracket. The fuel pump relay may be faulty. Also verify the computer ground for both relays, since the computer supplies that ground.

Conversation Summary

The owner of a 1986 Dodge Ram 150 4x4 cannot get power from the auto shutdown relay to the in-tank fuel pump, although the pump runs when powered directly. One expert advised checking the ignition switch because it should power the relay. The owner then reported power at the relay with the ignition on but still no power to the pump. Another reply said power should go from the auto shutdown relay to the fuel pump relay, so that relay may be the problem, and noted that the computer supplies the ground for both relays.