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Ford F-550 losing power

Discussion in 'Trucks' started by willie59, Jul 15, 2010.

  1. willie59

    willie59 Super Moderator

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    Wow, finally got to work on something other than a freakin' Bobcat for a change! :tong

    Customer brought in a 2001 Ford F-550 with 7.3 Powerstroke, said the engine was losing power. Took the truck for a drive, sure enough, get it under a load and it acted like it was running out of fuel. Checked fuel filter, filter clean. Put a pressure gauge on the fuel filter, started it up, went to 45 psi and held, normal enough.


    7.3 fuel problem 001.jpg


    Ran the hose and gauge out the backside of the hood and shut the hood so that I would have a good view of gauge while driving.


    7.3 fuel problem 002.jpg


    Holy Crap! Didn't even get wound through second gear going down hill and she hit zeeeeerrrro psi!


    7.3 fuel problem 003.jpg


    Limped back to lower gate of lot, engine running like crap. After sitting for a few minutes at idle, fuel pressure recovered. Sure sign of fuel supply restriction, most likely inside fuel tank.


    7.3 fuel problem 006.jpg


    Dropped the fuel tank and pulled the pickup assembly. That white cartridge is where the problem is going to be.


    7.3 fuel problem 007.jpg
     
  2. willie59

    willie59 Super Moderator

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    Popped the bottom out of the plastic cartridge, there's two strainer screens in there. They were both clogged tighter than a Kentucky coal country motel shower drain.


    7.3 fuel problem 008.jpg


    Here's one strainer cleaned, and it's very unhappy twin. Cleaned the inside of fuel tank with degreaser and pressure washer. Used the suck bucket to evacuate dirty wash water from tank. Got everything put back together and it runs like a champ again.


    7.3 fuel problem 010.jpg
     
  3. Steve Frazier

    Steve Frazier Founder

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    I've had the same thing happened to both of my Super Dutys. It's a problem that plagues the cab and chassis models. The galvanizing flakes off inside the tank and clogs the strainer in the mixing chamber. Mine both occurred in extreme cold weather where fuel flow is critical.
     
  4. PSDF350

    PSDF350 Senior Member

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    Sorry for hijack. But do you think that could be the problem I am having? My 01 7.3 550 seems to not so much lose power but not actually rev. Like say you step on pedal and nothing really happens motor kinda shimmies:beatsme but tach dont move off of say 1,000 rpms. Don't happen when your going only sometimes when you put in gear to go forward or reverse (mostly noticed it happen in reverse). Anway again sorry for hijack. Thanks!!!!
     
  5. mitch504

    mitch504 Senior Member

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    How do you like your service truck we see through the windshield in the second photo? I have been thinking about getting one but wonder if all my workers would have to get a CDL? (cartoon drivers license):D
     
  6. willie59

    willie59 Super Moderator

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    Kinda doubt it PSDF350. Does your "service engine soon" light come on when it happens? Sounds like an electronic control problem to me. Have someone check the codes on it, might get some info from that.



    Actually, if you have a large spread of land you work on, those little trucks are handy as a pocket on a shirt.
     
  7. Autocar

    Autocar Senior Member

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    Interesting problem with great pictures kind of self explanatory that way. :)
     
  8. truckboy

    truckboy Banned

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    Replace the fuel filter and see if it changes. ifno check the out put from the pump, replace if necessary.
    try air filters and check the exhaust. if its got a carb check the choke plate. or try funning a fuel or card cleaner through the fuel system
     
  9. PSDF350

    PSDF350 Senior Member

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    Now you mention that I bet thats exactly what it is. Because it does seem to have a couple electrical quirks like door ajar light on, radio losing volume or even raising as you try to turn it down, also when you shut truck down the radio will squack.
     
  10. willie59

    willie59 Super Moderator

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    Wow dude, you got some crazy stuff going on. I wouldn't know where to start with stuff like that. :beatsme
     
  11. Dualie

    Dualie Senior Member

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    I would say you might have a leaky windshield. gets down into the GEM module under the dash. GEM = General Electric Module controls all the on board functions not engine related.

    Might also be a leaking cab light.
     
  12. willie59

    willie59 Super Moderator

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    Wow, didn't even know about that one Dualie. I take it this is something you've seen before?
     
  13. barklee

    barklee Senior Member

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    My 450 is doing something similar. When your driving it misses and seems like its going to run out of fuel. i replaced the fuel filters.... the one under the hood was almost twisted in half! The one on the frame rail had that metallic crap in it. Should i drop the tank and clean the screens? How long did it take to do what you did?
     
  14. daman

    daman Well-Known Member

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    Looks like algae growth???
     
  15. PSDF350

    PSDF350 Senior Member

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    Thanks dually!!!! There's no leaking I can find even with the torrentail rains we have been having lately. But thats not saying there wasn't at some point I have only owend truck a few months. As for that GEM whats it look like I got under there ad took a peek but it's all greek to me.
     
  16. mikesheldon

    mikesheldon Member

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    Nice way explain work problem kind of you solved it by yourself but try having a computer diagnostic test done on it and gauge your fuel pressure. this should head you in the right direction.