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Fuel Leak

Discussion in '7.3L Powerstroke Diesels' started by spg, May 3, 2021 at 9:54 AM.

  1. spg

    spg Big Red

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    What would be the most obvious starting point to look at for a minor fuel leak in the valley of the 7.3PSD engine?
     
  2. greenskeeper

    greenskeeper Full Access Member

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    Lots of places. Clean the area good, start it up and start looking.

    Could be the lift pump itself, hose connections, fuel bowl o-rings, etc.
     
  3. spg

    spg Big Red

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    I have done that, Nothing obvious. Just wondered if anything was more common before I started taking it apart. Nothing on the fuel bowl is leaking.
     
  4. 79jasper

    79jasper Chickenhawk

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    There's plenty on the fuel bowl that can leak, that are "hard" to see. Filter restriction sensor, drain valve, regulator, water in fuel sensor, even the bowl itself can corrode through.
    The fuel lines between the pump and filter.
    The lift pump itself. The Banjo bolt on the pump. The fuel lines to the heads. The return lines.
    Just have to clean it more and look closer.

    Sent from my SM-G988U using Tapatalk
     
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  5. lotzagoodstuff

    lotzagoodstuff Supporting Member Supporting Member

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    Go get two rolls of paper towels, two cans of carb cleaner, a good air gun with a long tip, a bright flashlight and a small inspection mirror, hopefully on the end of a telescopic handle.

    Mop up every bit of diesel you can in the valley, spray the rest with carb cleaner and blow off everything with compressed air. Removing the Y pipe and hump hoses between the turbo and intakes will help you get to the tight areas beneath the fuel bowl.

    Get it spotless/dry, then start the truck and use your flashlight and mirror to see where the leak starts. It might not leak at idle, in which case you can have a friend hold the idle at an elevated speed and keep looking. Then, after it doesn’t leak again, take it for a drive and it will leak when you aren’t looking at it and the valley will be all wet and you can start over.

    The stock fuel bowl has many, many places to leak. I removed and resealed fuel bowl, changed everything hose and clamp, and still had a tough time finding an intermittent fuel leak. My fuel restriction sensor would actually leak through the body of the sensor (not the threads) and only when it was under load. I put a brass plug in it but only after I pulled the bowl no less than half a dozen times.

    Good luck. I believe the stock fuel bowl leaking makes a lot of folks go the e-fuel route.
     
  6. greenskeeper

    greenskeeper Full Access Member

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    I doubt it’s the pump then. When that fails it will fill the valley through the weep hole.

    Probably a fuel bowl o ring or drain selector leaking.
     

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