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Thread: Losing Faith

  1. #1

    Default Losing Faith

    I've been trying to get this HR-580-VS carb to work for four months (LINK & LINK). I bought it secondhand, but it looked brand new. I just can't get it to work. First the float level was going up & down. Then the front float was flooding. Then the pressure was going up & down, which doesn't sound like a carb issue, but never happened before. Now the rear bowl is flooding and I was never able to get the off idle stumble out of it completely. I followed the advice from Holley step-by-step to set floats, I put the fuel pressure right where they said, I set accelerator pump with .015" feeler gauge as instructed. I don't know what to do? Getting a carb to run shouldn't be this complicated. I ran an Edelbrock 1406 for years and it ran well out of the box. I have always heard Holley is a great carb, but hard to tune. I didn't think it was THIS true. I'm not sure what my next step should be. I'm just frustrated and want my truck to work again.

  2. #2

    Default

    I decided to try and address my fuel problems from all angles, instead of just blaming the carb. I put in new needle & seat and changed the fuel filter. I'm in the process of insulating the fuel lines to make sure it's not a heat issue. The line was hot. I don't think it was hot enough to cause issues, but it was too hot to keep holding. So it won't hurt either way.

  3. #3
    Join Date
    Nov 2014
    Location
    Ont. Canada
    Posts
    312

    Default

    One easy way to tell if you're cooking the fuel in the lines, is to cover the vent tubes with your fingers. If it's boiling fuel in the lines, it will pump the vapors past the needle & seat a lot easier than it will pump fuel past the needle & seat. Once the vent tubes are covered it will build pressure and push the fuel out the air bleeds & boosters.

  4. #4

    Default

    I'll try that, thanks.

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