Fuel pump low voltage - Ford Powerstroke Diesel Forum
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Old 04-06-2011, 06:05 PM
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Fuel pump low voltage

Hello guys. This is my first post in here so bear with me. I have a problem with my 02 F-350 ps. A little history. It has 205K miles on it and has been maintained regularly.
For the past year the trucks been running really rough when just cranking it. Now this isn't cold weather sluggishness. It happens if its 90 degrees of 20 degrees outside. It has been acting like it only hits on 6 before it get good and warm and starts running good. There hasn't been any codes and I have repaired the injector harness which used to come apart.

This problem happened yesterday and left me waiting on a tow. The truck started running rough just like it has been doing for a year on warm up so I thought nothing of it. Two mile from the house I lost all power and could hear dry injectors clicking. It made it another half a mile before it died.
I got it to the house and pulled the fuel pump since it wasn't running when I turned on the ignition. I was skeptical so I hot wired it to the battery and the pump started pumping like it was new. I checked the voltage on the pumps leads and it was at 7 volts. I searched and searched for the pump relay with no luck. Someone told me it was behind the radio so I went to digging. There was a relay back there. A big blue one with a different plug layout than the standard relays. Is this the relay for the pump? I'm stumped. on this voltage problem and any help would be greatly appreciated.
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Old 04-07-2011, 06:17 AM
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On an '02 that relay is actually built-in to the fuse panel and I don't think it's replaceable...
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Old 04-07-2011, 05:47 PM
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Yeah I found out about the integrated relay today. It was a faulty inertia switch that killed the fuel pump.
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