F250 Fuel Pump Problem

[nedsim]

Long shot here, but I'm looking for help with an ongoing fuel pump issue with my '06 F250, 5.4 liter.

The short version is the pump does not run. I can make it run by pulling the connector off the pump driver module and jumping the pins so the pump is connected directly to the the 12V supply. The pump driver module is new and exhibits the same behavior as the old module, so I'm quite certain that it's not the module itself. I've tried enough stuff that the only thing that makes sense to me at this point is that the control signal is not getting thru to the driver module, either because the ECM is not generating the signal, or there's a bad connection somewhere that's interrupting the signal.

My mechanic had a similar problem with an E350 (I think) that turned out to be a bad ground strap between the frame and body. He cleaned and remade the connection and that seemed to fix the problem, but it came back with identical symptoms after a short time. This most recent time I rechecked and refastened the jumper but it didn't help.

Either suggestions on fixes, or a more appropriate place to ask for help are appreciated. Lots more detail available if anyone here is familiar with this system and if it'll help pin down the problem.

 

[Max Barker]

I have the same problem on an 2007 F250. Can make it run by jumping and sending a straight 12v to the pump, but it runs at too high of a pressure (75psi) and throws a check engine light. Did you find a solution?

 

[Oletrapper]

Long shot here, but I'm looking for help with an ongoing fuel pump issue with my '06 F250, 5.4 liter.

The short version is the pump does not run. I can make it run by pulling the connector off the pump driver module and jumping the pins so the pump is connected directly to the the 12V supply. The pump driver module is new and exhibits the same behavior as the old module, so I'm quite certain that it's not the module itself. I've tried enough stuff that the only thing that makes sense to me at this point is that the control signal is not getting thru to the driver module, either because the ECM is not generating the signal, or there's a bad connection somewhere that's interrupting the signal.

My mechanic had a similar problem with an E350 (I think) that turned out to be a bad ground strap between the frame and body. He cleaned and remade the connection and that seemed to fix the problem, but it came back with identical symptoms after a short time. This most recent time I rechecked and refastened the jumper but it didn't help.

Either suggestions on fixes, or a more appropriate place to ask for help are appreciated. Lots more detail available if anyone here is familiar with this system and if it'll help pin down the problem.

I had a similar problem on my F-350. I feel certain you have a bad ground. It must be perfectly clean. On both ends. If you know where it is, remove completely, clean and I mean polish clean, both ends and especially the frame areas. Bolts and washers also. It's gotta be clean. jmho Hope ya get it going. OT

 

[nedsim]

I have the same problem on an 2007 F250. Can make it run by jumping and sending a straight 12v to the pump, but it runs at too high of a pressure (75psi) and throws a check engine light. Did you find a solution?

After re-cleaning, refastening, and measuring the resistance (zero) and voltage drop (zero) between the body and frame the problem was still there. I brought it back to my mechanic and he found a frayed shield/ground in the harness to the pump driver module. Since he patched that up I haven't had a problem. But I keep a couple jumpers in the truck to bypass the driver module just in case, so I don't get stranded.

You don't say how you've connected 12V direct to the pump, but the easiest way I've found is to unplug the connector to the driver module and jump the appropriate terminals in the harness connector. I can elaborate if it'd be helpful.

Consensus is that it's a ground issue, and the successful repairs bear that out, but I actually don't understand why that would be so. The harness includes both positive and ground that feed the driver, 2 wires from the driver to the pump, and the PWM control signal between the ECM and the driver is also double ended.

And who figured a system with a pressure transducer -> ECM -> driver -> pump is a better system than a pump that runs all the time with a pressure controlled return to the tank?