Fuel Problem (Carb 302)

Discussion in 'Fox 5.0 Mustang Tech' started by kure91, Apr 8, 2013.


  1. kure91

    kure91 New Member

    Joined:
    Feb 7, 2013
    Messages:
    9
    Likes Received:
    0
    Trophy Points:
    1
    I took my car to the track today for the first time, 1/4 mile test and tune. As far as I know its a stock 302. I got a msd 6al and msd distributor (pn 8582). Holley 670 Street Avenger (65 jets) and supposedly 373 gears (questionable lol). Problem is around 4k in third gear the car falls flat on its face, shift to fourth and its fine. I know its a fuel issue because before I went to the track I changed the plugs and they were suggesting that I was running lean. Im thinking I need either bigger jets or bigger fuel pump, any advice would be greatly appreciated.
  2. 7991LXnSHO

    7991LXnSHO Active Member

    Joined:
    Sep 1, 2010
    Messages:
    873
    Likes Received:
    64
    Trophy Points:
    29
    Location:
    Central USA
    I would check float levels first and then needle and seat action. To me, falling on its face is very drastic for jetting issues.


    Sponsored Ad

  3. ratio411

    ratio411 Founding Member

    Joined:
    Apr 22, 2002
    Messages:
    3,872
    Likes Received:
    69
    Trophy Points:
    69
    Location:
    Pensacola FL
    What does it do at 4k rpm in any other gear?
    If it's a fuel issue, it won't matter what gear it's in, only rpm/load.

Share This Page