why is my carb spitting fuel out of the top? - Chevy Nova Forum
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Old 21st-March-2010, 07:12 PM   #1
chevyIIguy

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why is my carb spitting fuel out of the top?

I just got my ignition hooked up when i started my car it wont stay running but when it is it is spitting fuel out of the top of the carb. Some one told me it could be a timimg problem is there a way to set the timimg with out it running? the guy i bought the motor from says it run 38* fixed timing. PLease help!
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Old 21st-March-2010, 07:22 PM   #2
Lmonkey

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Float level?
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Old 21st-March-2010, 07:26 PM   #3
chevyIIguy

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the carb is a brand new edelbrock 600 could i have a bad pressure regulator my gauge says 4psi when the motor is trying to run but if i leave the fuel pump on it goes to 11 or 12psi.
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Old 21st-March-2010, 07:34 PM   #4
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A lot of time trash gets stuck in the needle and seat. With it running try and pinch off the fuel line till it wants to die and then release the fuel line. Some times that will wash out the trash. Do it a couple of times. If that don't work then the float level might be to high or the float has a hole in it and it sunk.
The press. should be around 6-8 PSI tops.

Timing will have nothing to do with the fuel overflowing
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Old 21st-March-2010, 07:49 PM   #5
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Originally Posted by chevyIIguy View Post
the carb is a brand new edelbrock 600 could i have a bad pressure regulator my gauge says 4psi when the motor is trying to run but if i leave the fuel pump on it goes to 11 or 12psi.
You are running too much fuel pressure, 6 to 8 at the most is ok for a carb. 11-12 can easily blow past the needle and seat and over fill the bowls
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Old 21st-March-2010, 08:54 PM   #6
bp626indamix

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your needle and seat need to be cleaned.
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Old 21st-March-2010, 09:00 PM   #7
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How do I lower the fule pressure do I turn the screw down or up and how do I clean the needle and seat ( I've never had a carb before I'm a reformed ricer)
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Old 21st-March-2010, 09:27 PM   #8
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How do I lower the fule pressure do I turn the screw down or up and how do I clean the needle and seat ( I've never had a carb before I'm a reformed ricer)
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Old 21st-March-2010, 09:33 PM   #9
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loosen the jam nut and un-screw the allen head, try 1/2 turn at a time, re-tighten the jam nut. If your fuel press was really at 12# then I can assure you that was the cause and no need to clean your needle and seat.
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Old 21st-March-2010, 10:06 PM   #10
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loosen the jam nut and un-screw the allen head, try 1/2 turn at a time, re-tighten the jam nut. If your fuel press was really at 12# then I can assure you that was the cause and no need to clean your needle and seat.
Exactly as Ryan says..... get the pressure down, if still acts up then think about dirt in the needle and seat.
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Old 22nd-March-2010, 10:59 AM   #11
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Lowered the pressure and no more fuel fountian but now it won't start at all maybe I went to low when the car is not running the fuel pressure is at 8 while cranking it drops to 5 1/2 but that should still let it fire right?
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Old 22nd-March-2010, 02:09 PM   #12
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Sounds like a problem im having.

I started looking into my spark more. After checking my fuel lines/filter/bypass I have come to the conclusion that it must be spark. With full bowls and the fuel pump turned off the car should start and run until the bowls are empty.

I doubt its a fuel problem. Get your car started with the fuel in the bowls then work around the fuel pressure.
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Old 22nd-March-2010, 02:19 PM   #13
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What type of ignition do you have? If you have the point type, you may need to look at your points they may be bad. Like a few said, it sounds like the carb needs a closer look, your pressure sounds good if its around 8 psi.

A car needs two things to fire.....
1. Fuel (which you have)
2. Spark (look a little closer, or upgrade)
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Old 22nd-March-2010, 02:24 PM   #14
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I have a msd 6al box and the car tries to fire and it pops thru the exhaust with a pretty blue flame ( I still have open headers) would it matter that I have no module in my distributor its hooked right up to the box the guy I got the motor from said that's how he ran it.
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Old 22nd-March-2010, 02:46 PM   #15
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If your running a MSD Dist it should have a green and purple wire coming out of it. This is the magnetic pick up, keep in mind that the longer these two wires are the more problems you will incounter will a bad signal. This can cause your back firing. Also these two wire MUST be twisted this will eliminate any bad signal, Basiacly its a choke in eletronic terms.
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