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Author Topic:   Carb Help Please
Dirt Roller

Total posts: 20
posted February 13, 2005 02:47 PM  
I have torn down my carb and completely cleaned it and made it bind free. I installed it the other day and when you turn the motor over it starts pouring methanol out of the drivers side rear booster (the part that looks like a ring that slightly protrudes into the barrels). It will stop after a bit, but when you turn the motor over again it starts back and already has the motor flooded out. Is this a power valve problem, or is it something else. Also I am running methanol with a 9lb pump and no return line or pressure regulator. What kind of power valve would be the best to get? My carb is a Holley 4150HP.

big wally
Dirt Newbie

Total posts: 2
posted February 13, 2005 03:13 PM  
I hope that we get some help on this one. I have the same problem with mine. It doesn't do it all the time, but when it does, the alky really pours in. I have a BG throttle by-pass and the gauge is only showing 3-4 lbs. at idle.

Dirt Full Roller

Total posts: 30
posted February 16, 2005 06:42 PM  
I'm not sure if alky carbs are much different than gas,other than the flow.
The same thing happened to me on my gas carb and I adjusted the float lower and that fixed it

The Flash32
Dirt Maniac

Total posts: 120
posted February 16, 2005 08:30 PM  
yep, sounds like float level is too high!

Dirt Maniac

Total posts: 180
posted February 18, 2005 11:02 PM  
You are running 9 psi all the time, with no regulator, bypass, or return?

If thats the case, your needle and seat won't hold back much more than 4-5 psi of fuel pressure. My guess is that as you crank the motor, the pressure is pushing alky into the carb bowl and simply overflowing the float bowl. If the floats can't close the needle and seat, fuel flows out of the carb and down into the motor.

Or, you could just have a faulty needle/seat, or one that is stuck open.

[This message has been edited by sdracer12 (edited February 18, 2005).]

Dirt Freak

Total posts: 233
posted February 19, 2005 03:05 PM  
I can understand the needle and seat or the float problem, however, it cannot be the other thing. We have run this setup for 2 years now and this is the first time we have had problems.

Dirt Maniac

Total posts: 180
posted February 19, 2005 04:15 PM  
floats could also be crushed if brass or absorbed alky if nytrophil, then the needle and seat wont shut off creating that problem. I tried 11lbs with no bypass and it crushed brass floats like a tin can and I now replace the nytrophil every year. I can't get 2 seasons out of them before they start absorbing too much alky to float properly.

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