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Old 02-05-2005, 09:12 PM
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3310 vacuum secondary holley carb problem

I have a sbc 355 10.14 compression 3310 750 holley dart2 heads my problem is when engines running and tuned my back boosters on the holley carb are leaking when I blip the throddle and return to idle there still leaking off then clears off and when I shut the car off front and back boosters are leaking into the intake. The fuel pump is manual and a high performance model have rebuilt carb, and can't seem to stop the problem no matter how low the floats are or how high to stop this problem. I'm at a lost. is it possible I have to much fuel pressure? from a cam pump? I've never seen this before any ideas and no I haven't hooked a fuel pressure gauge on it yet but I will in the next couple days. Thanks guys I know you'll help. Rick

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Old 02-05-2005, 09:15 PM
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accelerator pump

check and see if the accelerator pump is sticking. if not then you might be getting too much fuel pressure.
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Old 02-05-2005, 09:20 PM
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If it's leaking at the boosters I would pull out your needle and seat and look at the o'ring around it. It could be cut or damaged. No matter where you set your float the bowl will flood. I would then replace the assembly, 5 bucks well spent.
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Old 02-05-2005, 09:22 PM
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Check the fuel pressure. If the fuel pressure is ok check the needle and seat. Ive seen brand new needle and seats leak.
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Old 02-05-2005, 09:25 PM
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i rebuilt carb new needle in seats but first time running this pump and motor for that matter.
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Old 02-05-2005, 09:28 PM
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You have to be careful installing the needle and seat assembly. You can cut or roll the oring if it isn't lubed when installing it. I got a new Demon with this problem out of the box.
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Old 02-05-2005, 09:43 PM
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what was your fix?
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Old 02-05-2005, 09:45 PM
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Check the fuel pressure. If the fuel pressure is ok check the needle and seat. Ive seen brand new needle and seats leak.
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Old 02-05-2005, 10:05 PM
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Shooters

If the fuel is pulsating out of the shooters and the carb is too hot to lay your hand on it. It is generally a problem called perculation. The gas in the float bowels is boiling over. Lowering the float bowls won't always cure this problem. The best fix is a carburator heat shield.
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