I stepped into my car this morning and it would not start. The check engine light had been on for awhile but I have been putting off diagnosing it. I performed the stomp test, and code 1231 was returned. (Oxygen 2 sensor lean/rich control stop) I believe it is not related.



I then consulted Bentley to orient myself with the standard electrical tests.

I started by checking the fuel pump. The pump is receiving about 10 volts at the connector in the truck.

However I do not hear it running. How loud is it supposed to be? My ear is about 6 inches away from the pump when someone cranks the car.

Eric