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Old 08-24-2008, 02:55 AM
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new holley carb problem

bought a new holley carb put it on and the dam gas POURS out of the bowl vent tubes and theres no float adjustment. anyone know how to fix or just return for replacement....but if it happens again??????

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Last edited by smrat; 08-24-2008 at 03:49 AM.
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Old 08-24-2008, 03:26 AM
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What is your fuel pressure? More than 7psi and it can over power the needle valve.

You might want to pull the bowls and make sure everything is moving freely and that there is no trash in the needle valve.

Last edited by elliott; 08-24-2008 at 04:51 AM.
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Old 08-24-2008, 03:48 AM
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this is on a tunnelram setup the back carb is fine bought new last weekend, bought the other yesterday if the fuel press. is to high wouldnt both carbs be flooding out???. shouldnt have to take anything apart not after paying 250.00 pressure is at 7.5
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Old 08-24-2008, 04:36 AM
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Yes, I would expect both to flood if the pressure was too high, I'd say 7.5psi is fine, 7 is just a safe number, some will be fine up to 9.

Carburetors are very delicate, storing one upside down or on it's side for too long, for example during shipping, can cause problems like this. It doesn't take any effort to pull the bowls, I think Holley even uses reusable gaskets on all carburetors they sell now, so you don't have to buy replacements. I have never just bolted a carburetor on to an engine without checking inside first, it is a 5 minute job and prevents stuff like this. If you really don't want to pull the bowl, take it off, drain it, shake it and listen for the floats moving then put it back, but pulling the bowls is the right way to be sure everything is fine. If the floats are moving, you can try turning it upside down (which should raise the floats and close the needle valves) then blowing into the fuel inlet, you shouldn't be able to, if you can, something is wrong with the needle valves.

I would never consider a carburetor a bolt on and leave alone part, more often than not you are going to have to open it up, either to correct something or to tune it.

Last edited by elliott; 08-24-2008 at 04:44 AM.
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Old 08-24-2008, 06:14 AM
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The past new Holleys I have bought recently have all been less than bolt ons. I am also really disgusted at the fact that they did away with the external float adjustment on alot of the carbs now too. If you look in the tech manual now, it tells you to bend the float arm for proper adjustment. Take the bowl off and hold it upside down. The float should be basically flat with it held this way.
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