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Hot Rods Leaking rochester

Discussion in 'The Hokey Ass Message Board' started by Dentboys, Oct 17, 2012.

  1. Dentboys
    Joined: Dec 26, 2011
    Posts: 24

    Dentboys
    Member
    from California

    I have 51 chevy with a newly rebuilt carb, it leaks a lot. Checked the float and needle seat, put new fuel pump on thinking it was pumping to much fuel? It a Rochester 1 barrel on my 235 I need help
     
  2. pinkynoegg
    Joined: Dec 11, 2011
    Posts: 1,136

    pinkynoegg
    Member

    Those things are notorious for doing that. not much you can do but rebuild it with new gaskets
     
  3. INVISIBLEKID
    Joined: Jun 19, 2006
    Posts: 2,647

    INVISIBLEKID
    Member
    from Gilroy,CA

    Where's it leaking from? Shaft/top plate????
     
  4. ems customer service
    Joined: Nov 15, 2006
    Posts: 2,654

    ems customer service
    Member

    had the same problem, got a new rebuilt kit from the filling station, follow the instruction exactly, i set the float leval according to the instructions but on the lower leval in th efuel bowl. no problems after that
     
  5. Dentboys
    Joined: Dec 26, 2011
    Posts: 24

    Dentboys
    Member
    from California

    It's leaking by the shaft. I replaced gaskets twice. At the end of the month I plan on putting on a Fenton intake manifold, and Fenton headers with a dual carb set up. Does anybody know which carbs to go with? I am tired of the leakin
     
  6. Dentboys
    Joined: Dec 26, 2011
    Posts: 24

    Dentboys
    Member
    from California

  7. INVISIBLEKID
    Joined: Jun 19, 2006
    Posts: 2,647

    INVISIBLEKID
    Member
    from Gilroy,CA


    "by the shaft" or from it? not being an ***,but if it's coming from the shaft,well,kinda answers itself. The baseplate gasket is far enough away to tell,and "you replaced those?" :confused:
    New carbs on your new set-up,or using your existing one as part of the set-up?
     
  8. diamond jeff
    Joined: Sep 6, 2012
    Posts: 61

    diamond jeff
    Member
    from montana

    Like ems said try lowering the float level, maybe by a 1/16 at a time. How does the carb perform? Besides the leaking issue.
     
  9. Dentboys
    Joined: Dec 26, 2011
    Posts: 24

    Dentboys
    Member
    from California

    Leaking through shaft sorry, about that and no I want to buy two different ones, I saw in speedway 9super7 not sure if the would work or fit the Fenton intake manifold?
     
  10. bobss396
    Joined: Aug 27, 2008
    Posts: 18,752

    bobss396
    Member

    A badly worn base can do it, so can a high float, I like float suggestion in post #8. Also if the sections are loose, that can do it too. Grab the carb at the top and give it a twist.

    Bob
     
  11. diamond jeff
    Joined: Sep 6, 2012
    Posts: 61

    diamond jeff
    Member
    from montana

    I might be wrong, but I think the super 97s are two barrels? I know of a guy that ran dual r1 monojets and they worked well.
     
  12. inline 292
    Joined: Aug 25, 2006
    Posts: 295

    inline 292
    Member

    Drop the float level down some. I ***ume it leaks when you shut the motor off & it sits a while? Engine heat & trapped line pressure may be forcicing gas past the float valve. That overfills it, & it drips down & hits the throttle plate/shaft. Runs to the end & leaks out. IF you want a replacement carb, I would look for a Carter YF model.
     
  13. Dane
    Joined: May 6, 2010
    Posts: 1,351

    Dane
    Member
    from Soquel, CA

    Not much you can do because the base has worn to the point it leaks fuel past the throttle shaft. I looked for a kit to fix the one barrel Rochesters I had and there are none. A four barrel Rochester shaft repair kit could probably adapted, but in the end it might be cheaper to buy a reproduction.

    http://www.throttleshaftrepair.com/
     
  14. ems customer service
    Joined: Nov 15, 2006
    Posts: 2,654

    ems customer service
    Member

    the car runs great, i went to the low side of the spec's but still in factory range.

    if the shaft is leaking it has to be rebushed
     
  15. carbking
    Joined: Dec 20, 2008
    Posts: 3,977

    carbking
    Member

  16. Rich Wright
    Joined: Jan 9, 2008
    Posts: 3,918

    Rich Wright

    Your carb is OK and a lot of people like them but I'd just as soon use them for target practice. I used an adapter from Langdons intended for a 4 bolt Holley 2bbl. It conveniently has a boss added that matches up to Holley 94 (or Stromberg 97).
    I rebuilt a 94 and found my carb troubles disappeared. A significant increase power and..best of all... MPG went from 10 or less up to 18-20.

    It's on a stock 261 (other than headers) in my '51 pickup.
    I just got back from an 880 mile road trip and averaged 18mpg with absolutely no trouble climbing hills or pulling grades or p***ing cars when necessary.

    Disclaimer.... Before changing carbs I tried...for two years...to make the old 1bbl work... Several different carbs from the original up to a NOS heat riser choke model....all with the same results...
    I have a bucket full of 'me now....:eek:

    I think this might be a viable option for you. Even with a two carb set up.
    Try reading some articles on the Inliners International website.
    Also, Langdon has a nice article on Jim Carter Chevy Parts website that talks about Rochester 1bbl carbs and why they are tough to make work correctly over the whole power range.
    [​IMG]
    [​IMG]
     
  17. 52chev
    Joined: Jun 22, 2006
    Posts: 46

    52chev
    Member

    Hi. My carb has been rebuilt by an expert but leaks from the the hole under the accelerator pump... any thoughts. Truck runs awesome

    Sent from my SM-J530Y using The H.A.M.B. mobile app
     

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