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Author Topic:   holley 4412 problems
dode
Member
posted June 13, 2003 01:18 AM
Ok, I rebuilt a 4412 this weekend, and it seemed easy enough. I pretty much replaced everything that I took out. However, I tried to fire up the car tonight and it wouldn't start. I am getting fuel to the bowl and the float is set correctly. However, it seems that that is all the farther the fuel is getting. I don't know what the problem is. I used a Holley kit. I look down in the butterflies and I can see no evidence of fuel in there, even as I work the throttle. It is set with 75 jets, 4.5 power valve. Any ideas what to check? I'm guessing it has something to do with the accererator pump circuit? I don't understand all of that. The only parts I have there are the pump inlet check valve, the spring, and the diaphragm. Am I missing something there? Any idea where I should look? We are rained out so I am not worried about tomorrow, but I need to get this thing running. Thanks.

John

racer1030
Member
posted June 13, 2003 07:21 AM
Take the squirter off and make sure the check needle isn't stuck.


Earl Parker II
Member
posted June 13, 2003 07:22 AM
I would look at...

1. The pump cavity at the bottom of the fuel bowl. If you have the check-ball-and-strap type of check valve, make sure the ball isn't 'frozen' to the seat. If it is, use something small, like a toothpick, to carefully 'unfreeze' it, then use a little carburetor cleaner on a Q-tip to clean the ball and seat as best you can (I wouldn't use compressed air). If you have the red-rubber-umbrella type of check valve, make sure that the umbrella part is located in the pump cavity and not in the fuel bowl proper, i.e., that it hasn't been installed backwards. Don't laugh- I've seen this more than once.

2. Make sure that the pump passage in the metering block, leading from the pump cavity to the pump nozzle, is free and clear. Compressed air works well here.

3. Make sure that the pump check needle, located under the pump nozzle, isn't stuck to it's seat.

4. Check to see that the holes in the pump nozzle are clear, too.

5. If you're using a spring on top of the pump check needle to try to 'cure' the pullover problem, get rid of it. Any spring strong enough to affect the pullover deal will also lock up the whole pump mechanism.

Let us know if the above doesn't work

------------------
Earl Parker II
www.parkercarburetion.com
704.482.7588


dode
Member
posted June 16, 2003 02:40 PM
The needle was stuck. Thank you very much!

John

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