Starting trouble need some advise.

J Body General Discussion

  1. 83CMXGuy

    83CMXGuy Member

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    OK so I have an 83' Mirada that I took the lean burn off and replaced the carb from a 2bbl to a 4bbl with a new intake and electronic distributor.

    Here is the problem when we took off the Lean burn we also took out the Charcoal filter not knowing it was connected to the fuel vent from the gas tank (canister not avail to put back in). That being said now when i go to start the car it starts just fine when it's cold. But after running it for a while and then trying to restart it, it does not want to start up, it eventually does after pumping the pedal like a madman.

    So, my question is this I was told to put a filter on the line and either run the other end off of the filter to the carb or just point it down in the engine bay. Does anybody know or heard of this problem before and what was the solution? The carb is a new Edlebrock 600, so i'm not sure where to connect the line to even if i should. I really don't want all that gas smell to sit under the hood if i don't connect it somewhere.

    Any help would be greatly appreciated
    Brian
     
  2. Oldiron440

    Oldiron440 Well-Known Member

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    Eldelbrock carbs have a problem with today's fuels and boiling fuel after shutdown. Next time you shut off and go to start look and see if it's squirting fuel before you try starting.
    A good isolater under the carburetor will help and so will fuel with no alcohol. As a last resort an electric fuel pump here the tank will fix the problem.
     
  3. Aspen500

    Aspen500 Well-Known Member

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    Also,,,,,,try to use ethanol free gasoline if available in your area. Around here ethanol free 87 is about 20 cents more than "may contain up to 10% ethanol" gas.
    Ethanol will contribute some to hot start fuel problems.
    As Oldiron said, be sure to use a thick carb gasket to isolate the carb from some of the heat. Something like this: Summit RacingĀ® Carburetor Gaskets SUM-M08005
    Or,,,,,,,to isolate the heat even more, a carb heat shield line this: Mr. Gasket Carburetor Heat Shields 3710
    Some cars and trucks cam with these from the factory back in the '70's and early '80's.

    Biggest problem with today's fuel (ethanol free or not) is, it's made for high pressure EFI systems and tends to vaporize and "boil" a lot easier than the old days. With a carb and 6 psi there's nothing to prevent vaporizing. Think cooling system. Pressurized and the boiling will happen way past 212 degrees. Leave the cap off and it'll boil over on a 70 degree day. Not exactly the same thing but that's a good analogy anyways.
     
    Last edited: Jun 26, 2018
  4. Poly

    Poly Well-Known Member

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    Hi. Ok. From your description I would have to ask if your have slowly unscrewed the gas cap when the hard starting occurs, and what was the result ?

    Is the intake manifold hot hot hot under the carburetor ?

    Timing being off can cause hard starting when warmed up.

    If you blocked off the heat crossover passage in the new intake manifold(if so equipped), is the flapper at the exhaust manifold free to open ?

    I know, more questions than help.
     
  5. Dr Lebaron

    Dr Lebaron Well-Known Member

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  6. Duke5A

    Duke5A Well-Known Member

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    You're practically my neighbor - I live in northern Macomb county. First thing I would do is use a phenolic plastic spacer under the carb to insulate it from engine heat. I might even have one laying around, if not, they're cheap. For the vent you can probably just disconnect the rubber line from it back at the tank and find somewhere to mount it up high. Only reason to run it under the hood was for the emissions garbage.
     
  7. 83CMXGuy

    83CMXGuy Member

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    Thanks guys!! I finally had the chance to sit on hold long enough to talk to an Edlebrock specialist and they said the same thing. I ordered the spacer as you guys suggested, but was not aware of the Ethanol issue. I am hoping once I get it I will not have anymore problems.

    I'll let you all know how it turns out once i put it on and reroute that vent line.

    Thanks Again
    Brian
     
  8. 83CMXGuy

    83CMXGuy Member

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    Duke, Are you coming to the car show on the St Clair River on July 7th??
     
  9. Duke5A

    Duke5A Well-Known Member

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    You talking about the show at the park next to the salt plant? Absolutely. Dad lives right down the road from there. We'll be there at the least. I'll try and get a few more.
     
  10. 83CMXGuy

    83CMXGuy Member

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    excellent stop by i'll be the only Mirada there. LOL