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Old 05-13-2002, 01:59 PM
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Thumbs down Holley carb

I'm suffering from CRS. It's been over 25 years since I last fooled with a Holley carb and I have a problem that I can't figure out. The engine is hard starting after it sits over night and I've traced the3 problem to the booster jets not delivering a shot of gas when I pump the throttle. I don't know if the fuel bowl is being drained out or what's causeing the accelerator pump to loose prime. Any ideas would be welcomed. Also, what does the power valve do and what are the symptoms of it going bad? Thanks again <img src="confused.gif" border="0">

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Old 05-13-2002, 02:33 PM
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i'm not sure about the power valve's function, but i think you're going to have to take your carb apart. If it is draining dry then the first thing i would check is your main inlet valve. Check your floats and make sure that the valve is shutting properly. Also check out your accelerator pump and make sure that the rubber washer is in good condition and sealing inside its well. These are two main things that could be causing you problems. If your carb is generally in poor condition then i would suggest that you rebuild it.

Good Luck

JB
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Old 05-15-2002, 04:29 PM
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[quote]Originally posted by johnnymopar:
<strong>i'm not sure about the power valve's function, but i think you're going to have to take your carb apart. If it is draining dry then the first thing i would check is your main inlet valve. Check your floats and make sure that the valve is shutting properly. Also check out your accelerator pump and make sure that the rubber washer is in good condition and sealing inside its well. These are two main things that could be causing you problems. If your carb is generally in poor condition then i would suggest that you rebuild it.

Good Luck

JB</strong><hr></blockquote>

I had the same prob with mine. I found out that the float bowls are draining due to not sealing. My accelurator pump was bad. The gasket was bad.
dustin
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Old 05-15-2002, 04:51 PM
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sure sounds like rebuild time. i agree with the others ,i had similar problem, gaskets were baaaaad!
let us know how you make out. also,do not hesitate to contact holley ,www.holley.com they are good people to work with. luck to ya!
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Old 05-17-2002, 03:21 AM
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Yeah it sounds like rebuild time !. The problem with hard starting could be Fuel percolation after you turn the motor off,fuel boils due to heat going to the top of the motor etc.. A heat sheild under the carb. will help as well as an insulated plate under the carb. The gaskets could all be suspect,with leaks etc.. The Power valve richens the Air/Fuel mixture when you "floor it". It's operated by "falling" vacuum. You will see numbers on it,such as 4.5,6.5,8.5 etc.. Use a vacuum gauge to see what your motor is doing. These numbers indicate the inches of Mercury (Hg)at which it opens. In fact what happens is High manifold vacuum at idle holds the P/Valve closed (inoperable),but when vacuum drops below the Power Valves Hg,it opens and richens the Fuel mix.
Now if it's opening at idle or off idle or leaking as they do sometimes (due to backfires through carb.)your motor will run rich,won't idle properly,won't respond properly to idle enrichment adjustments. I suggest buying a Holley carbs book,or borrowing one !!. Hope this helps you out.........Barry.M
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Old 05-17-2002, 02:55 PM
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Thanks to everyone who responded. I'll check it out at post what I find out. And thanks Barry, now I know what a power valve does.
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