My sons camaro had a leaky carb that we couldn't get to stop leaking so we rebuilt one that I had on the shelf.

It is a 72 Q-jet.

When we put it on, the car acted like it had a miss in the engine.

I finally found that it was leaking fuel through the (ok here goes since I don't know what they are called) little round things you can see above the primary butterfly. It is where fule comes out when you hit the throttle.

Why are they leaking at idle? I know this must be the problem as we put the old carb back on and the problem went away.

Well, I'm not an expert but could this happen if the float level is too high??

Float level too high or the float is sinking (absorbing gas) and needs replacing.

If the problem persists after replacing the float, someone here recently suggested a larger PCV valve. I don't recall the part number off hand, but the gentleman said it stopped the fuel dribbling problem in its tracks.

Hey Thanks soo much for the ideas!! I will give those a try this weekend.

thanks again.
Tim

<BLOCKQUOTE>quote:</font><HR>Originally posted by Randy Mosier:
If the problem persists after replacing the float, someone here recently suggested a larger PCV valve. I don't recall the part number off hand, but the gentleman said it stopped the fuel dribbling problem in its tracks. <HR></BLOCKQUOTE>


That would be me. First though, make sure that the float is set to specs, and very important: idle speed set correctly. If this doesn't fix the nozzle drip problem, make sure that your vacuum advance is hooked up to manifold vacuum NOT ported. Finally, if it still drips get the larger PCV. Do a search in engine and drivetrain under my username. The part number is included.

Good Luck!

Mike

Also make sure there are no vacuum leaks anywhere causing the leak.

Also, check your fuel pressure. Q-jets won't take a lot of fuel pressure. Six psi is about it, or it could be overwhelming the needle. Preferably, you want about 4-1/2 psi. Especially on the old ones. They had a different flucrum length that put less pressure on the needle.