Hey all, long time lurker- used to hang around 7.3 forum. 1st diesel was a 1997 F350 dually (White Lightning). Upgraded last year to a 2015 F350 (The Rocket Sled)- the kids named it hahaha.
Had to take the 6.7 (9200 miles) into the shop... Last Sunday I took the truck out and about 5 minutes from home I got the low fuel pressure warning. Pulled over and tried to purge air out of fuel system- the low pressure pump was making a terrible racket. Turned around and limped home- reduced power came on soon after. Parked it until I could get to the dealership on Tues. Long story short- dropped it off at the dealer (low pressure pump still making noise/ no low fuel waning, just CEL light). Called to check status today- dealer can't seem to duplicate problem. Service advisor said if mechanic can't find anything wrong, service manager was going to take it out and try to duplicate.
The is the 2nd time I've got the low fuel pressure warming. The first time (around 4000mi. ) was in winter- I changed out fuel filters and it went away. Thankfully neither time I was towing the 5th wheel. Just had to vent-
I have to get this figured out. I wouldn't thing the filter could get clogged within 5k miles. Have a camping trip scheduled next week!!


Rocket Sled

 

Do you use fuel additives?

 

Yes- Pm22a religiously every tank

 

See this thread. Check out post 26 on page 2 through post 36. Good possibility you have the same.

https://www.ford-trucks.com/forums/1...g-for-tow.html

I think that's where Y2kW57 was going with his question.

 

Bingo. That is where I was going.

There is nothing wrong with using PM-22a.

The issue is the container that PM-22a comes in. There is a small cardboard disc in the cap that often finds it's way into the tank. The fact that your Service Advisor and dealer tech can't replicate the problem is a sure indication of the kind of random intermittency that occurs when the this little disc floats into the path of the fuel pickup, blocking it, and then, floats away again, leading to the problem disappearing as mysteriously as it began.

To fix the problem permanently, drop the tank. Remove the sending unit, and remove the little cardboard cap disc that snuck down the fuel filler tube from the PM-22a that you religiously pour in. Put it all back together, and you'll have reliability again.

 

Hmmm. I have read that thread and thought, thank god I've
Never done that... I guess 1 cardboard could have slipped past. I've always been extra careful. Should I bring this up to dealer (they still have my truck) or just do it myself?
I am a cheapskate and would rather do it myself if dealer would charge for something like this. Thanks for the info guys.

 

The whining low pressure pump seems to be a good indication of this, if a recent filter change hasn't happened.

 

If you want to save money you do it yourself, but you get the aggravation of dropping the tank and looking and putting it all back together. Plus there is a your time factor as well.

This is going to make me put a metal screen in the filler tube of the truck. I may have to design one...

 

Yay! I'm famous. No, wait.