Carb heat soak

Discussion in 'Small Block Tech' started by Dwayne B, May 8, 2018.

  1. Dwayne B

    Dwayne B Well-Known Member

    When I drove my car last Friday ,when I would let it set for some time and try to start it ,I had to hold the gas pedal down to get it to start and it smelled flooded. I think the carb is getting heat soaked.Im running A q jet carb with A 1/4 gasket .I was wondering what should I do.I run gas with ethanol in it,that is all I can buy local .I have read ethanol boils easy .
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    What is your coolant temperature? Is the exhaust cross over in the intake blocked or open?
     
  3. Dwayne B

    Dwayne B Well-Known Member

    The temperature is around 190 to 195.The crossover in the intake is open.
     
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Well, there's your answer. The intake gets very hot.
     
  5. Dwayne B

    Dwayne B Well-Known Member

    Larry, what could I do ,I don't want to pull the intake back off.
     
  6. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

  7. Dwayne B

    Dwayne B Well-Known Member

    OK thanks Larry
    I'm not using the choke, I was going to when I put my motor back together .
     
  8. A 1/2" phenolic carb spacer will help reduce the effect of intake temps
     
  9. alec296

    alec296 i need another buick

    Sounds like carb needs to be cleaned also. It’s syphoning fuel from float bowl into intake .
     
  10. Fox's Den

    Fox's Den 355Xrs

    There is a spot in the bottom of those Q-Jets that can leak gas out of the bowl if not mistaken I read about it somewhere.
     
  11. Dwayne B

    Dwayne B Well-Known Member

    OK thanks guys for the help.
    I don't understand my GS A different car never did get heat soaked ,basically the same engine. The only thing may be the ethonal in the gas now days,I never ran ethonal gas in the GS.
     
  12. Dwayne B

    Dwayne B Well-Known Member

    I made A heat shield this evening out of some 16oz sheet copper I had. I left the carb on and used some cardboard and made A template using two pieces that notched around the carb and folded around each other.It looks A little crude but kinda cool made of copper.I test drove the car and temp got to 190,and the intake was very hot and the carb was cool.I think this is going to take care of my problem ,I will find out tomorrow me and my son are taking it on A trip .I didn't have time to buy something so I figured I would make something with what I had.
     

Share This Page