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Technical Stromberg 97 Leaking Help???

Discussion in 'The Hokey Ass Message Board' started by NATESBPD, Apr 4, 2026 at 4:07 PM.

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  1. NATESBPD
    Joined: Jul 5, 2008
    Posts: 111

    NATESBPD
    Member

    Leak 97.jpg Can someone please help point me in the right direction? My 97 is leaking through the accelerator pump.. I have rebuilt the carb. thrown a new 97 on and same thing? I even replaced the accelerator pump and it still does the same thing. It randomly leaks. I changed the fuel pump, and the only thing I can think is the float level?
     
  2. deadbeat
    Joined: May 3, 2006
    Posts: 905

    deadbeat
    Member

    Mechanical or electrical fuel pump? Too much pressure?
     
    flat Ike and dana barlow like this.
  3. NATESBPD
    Joined: Jul 5, 2008
    Posts: 111

    NATESBPD
    Member

    Engine.jpg Stock fuel pump.. stock everything...
     
    Last edited: Apr 4, 2026 at 4:57 PM
  4. swanwaco32
    Joined: Feb 7, 2005
    Posts: 154

    swanwaco32
    ALLIANCE MEMBER

    Fuel pressure is max 2.5-3. You can run it with the top cover off to see how high the level is. Just be prepared I case it runs over with fuel to put it out. Have a helper ?
     
  5. NATESBPD
    Joined: Jul 5, 2008
    Posts: 111

    NATESBPD
    Member

    with stock fuel pump.. if its too high.. how do I bring it down on the pressure? I don't 20260207_092930.jpg IMG_20201218_121245366.jpg think that is the problem due to it running for years with no issues?
     
  6. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 16,424

    Bandit Billy
    ALLIANCE MEMBER

    A Stromberg that leaks? First I've heard of it.
     
  7. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 16,424

    Bandit Billy
    ALLIANCE MEMBER

    Gravity and the needle/seat prevents leakage out the top of the 97. So, either gravity has changed or more likely your needle/seat/float is allowing too much fuel into the bowl. Since nothing new has been added (fuel pump) and we ***ume the delivery pressure has not changed, possibly the needle and seat have contaminates in them or the float is leaking? They are really simple carbs. Mine still leak...just saying they are simple.
     
    Tim and deadbeat like this.
  8. dana barlow
    Joined: May 30, 2006
    Posts: 5,502

    dana barlow
    Member
    from Miami Fla.

    Fuel PSI,needs to be under 2 bls,max of 2.5 is what I found years ago....
    Float high,yes,that only needs to be a tiny little bit high=leak>but also,ruff ideal/ low RPM vibes{ if engine has hot cam,can vib leak { running float low is good,as long as it not so low=lean. A ruff driveway/road can make splash leaks as well...
    My 94's also leak from same stuff....and I use 4x2
     
    deadbeat likes this.
  9. Flatheadjohn47
    Joined: Aug 18, 2012
    Posts: 1,439

    Flatheadjohn47
    Member
    from Lewes, DE

    If u have a stock fuel pump on your flatmotor, u can install BUILT UP SHIMS( gaskets material) under the base of the pump in effect “shortening the fuel pump pushrod” but really not altering the length of the pushrod;simply raising the base to provide less pump stroke—-be sure and run a inline gauge showing exact pressure(usually 2 lbs or less) between the pump and the carb or carbs…. IMG_1737.jpeg .
     
  10. Corn Fed
    Joined: May 16, 2002
    Posts: 3,453

    Corn Fed
    Member

    When you say it leaks, are you talking about a little seepage or is it running out?
    Put a gauge in line and see what the pressure is.
    All 3 of the 97's on my Model A seep. I chased them for a while then just accepted that they always would. Now I think of it as proof that all 3 are hooked up and not just dummies.
     
    deadbeat likes this.
  11. NATESBPD
    Joined: Jul 5, 2008
    Posts: 111

    NATESBPD
    Member

    thanks for the starting point... I will try to set the float lower. it is "just pouring out" the hole where the accelerator rod is, like the fuel is high.
    Thanks again for the replies!

    Here is a video of when it was running good. lol
     

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