Have an issue with the fuel pump running when the key is turned to on, and it doesn't stop running. The problem is intermittent, sometimes the pump runs then shuts off correctly, and sometimes it continues to run. I've perused the forums and followed the suggestions to replace the fuel pump relay and the PCM. Even with the new parts I still have the problem.

Could it be a gas cap issue? Is there a pressure sensor that could be bad?

Any suggestions will be appreciated.

1992 F150 XLT Lariat, 5.0 Manual Tranny

 

Click this, read the caption, & follow the first link in it:

(phone app link)

 

Thanks for the reply Steve!

I checked out the link you provided. Unless I missed something the posts were mostly about what could go wrong with the Powertrain Control Module or EEC or whatever those crazy kids are calling it these days. I should have been more clear in my post that I've already replaced the PCM (EEC, ECC) and the FP relay, but I'm still experiencing the exact same intermittent problem.

I had read similar posts here when researching my FP issues and that was the reason that I replaced the FP relay and the PCM/ECC/EEC.

My question was, since I still have the same problem could it be an issue with the FP, or the gas cap or a pressure sensor that I'm not aware of?

 

Thanks for the views and thanks for your help Steve! Since it's an issue that no one's seen before it's off to the garage with the old beast.

Keep 'em flying!