PLEASE HELP! I have a 2003 F-250 Super Duty 5.4L engine. I am getting 12 volts to the fuel pump relay which is the relay located behind the radio, but I am only getting 6 volts to the fuel pump.

Asked by Jun 30, 2014 at 06:32 PM about the Ford F-250 Super Duty

Question type: Maintenance & Repair

We replaced the fuel pump on my 2003 F-250 Super Duty truck. The truck still won't start.
The old fuel pump was tested and it was bad. The truck still would not start. The original
fuel pump relay that is located behind the radio showed signs of burn marks so we
replaced the relay. Now we are getting 12 volts to the new relay but only 6 volts to the fuel
pump.

2 Answers

I found that the fuel box was bad. I was told that this is a very common problem with these trucks.

40

What is a fuel box?

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