No power to the fuel pump?

Hi,

If you are able to turn the fuel pump on by jumping the relay, we need to check things at the relay itself. If you have a different relay with the same part number, switch them to see if it works. If you don't, here is a link that explains how to test a relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Now, if you look below, I attached a pic of the relay wiring schematic. I need you to first confirm both of the fuses I highlighted. In addition to confirming the fuses are good, make sure there is power to and from them.

If they are good, remove the relay. On the relay there will be 4 numbers, 30, 85, 86, and 87. Pins 30 and 85 are the power supplies. With the relay removed, determine which connector in the box each pin goes to and confirm pins 30 and 85 have power. Pin 85 will only have power with the key on. Pin 30 will have power at all times.

If these two pins have power, the last thing left (based on the idea you were able to jump it) is there is no ground path being provided by the PCM (pin 86). When you turn the key to start the vehicle, the PCM provides a ground to pin 86 completing the circuit on the primary side of the relay. When that happens, an electromagnet is energized closing the switch on the secondary side allowing power to run from pin 30 to 87, powering the pump.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Also, let me know if you have checked the auto shutdown (ASD circuit as well.

Take care and let me know what you find or if you have other questions.

Joe

See pic below.

Hi,

If there is power out from the relay to the pump but doesn't make it to the pump motor, then there must be a broken wire. Something is preventing power from getting there.

Do me a favor. I was under the impression that you jumped power at the relay. Remove the fuel pump relay and take a jumper wire and jump pins 87 and 30. If the pump runs, we have a power issue either at the relay or before it. If it doesn't, then we need to trace the power supply to see where power is lost.

Let me know.

Joe

Hi,

Thanks for the update. I'm glad to know you found the issue. As far as the problem, I suspected you would find a broken wire between the relay and pump. A connector makes it easier. LOL

Regardless, please feel free to come back anytime in the future. You are always welcome.

Take care,

Joe