i have an 85 12a with the stock nikki carb and the racing beat exhaust system.

I am having a couple problems but the major one is if my car sits for more than about six hours (overnight usually) it seems to be leaking gas through the jets into the engine causing me to have problems starting. it is not an excessive amount it seems because if i look in there there is usually no more than a couple of drops on top of the secondaries. i can't watch anything drop out. the major part of the issue is it is having trouble starting due to all of the gas that it collects overnight and i am unable to start it with the choke pulled. i have to either leave the spark plugs out or give it 3 or 4 starts without the choke pulled. it then idles at about 3-500 rpm for about 15 seconds and then jumps up to 700. if i push the gas in more than about 5 millimeter's it floods out and dies. if i push it in extremely slowly, i can work it up to about 2000 rpm and then pull the choke. after the choke is pulled it runs fine until warm. once it is warm the gas pedal has a dead spot and dies out if i push it too quickly. if i work it at a medium speed it is fine.

I did rebuild the carb a couple of months ago and it did great over the first month or so. I thought it was weird that i did not have to pump the gas to start it with the choke pulled though. Any ideas to what the problem might be would be awesome.

when i did the rebuild i noticed the metal rod on the back of the accelerator pump was about a millimeter shorter than the old one. that might have made a difference?

 

Check this: Fixing a Flooding Carburetor



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This may be a problem several people - - self included - - have fought for a long time. It's characterized by the fuel level in the bowls rising after shutdown, to the point where they can make gas flow out the ports into the carb throat.

For me, it always seemed to be worse on hot shutdowns, and also seems that some ethanol blend gasolines make the problem worse due to their higher volatility.

There seem to be a few different things that can cause it, the more common of which would be a failing or stuck vent solenoid on the carb or other obstruction in the bowl vent or tank vent system.

You could also have a saturated or plugged carbon canister.

Your symptoms are a bit different because your problems seem to persist long after you're re-started, so you may be facing something slightly different.

 

Yeah, I've seen this a few times at autocrosses with 1st gens. They make a run, then can't get the car started for the next one. Had to do some fast troubleshooting on more than a few occasions, but fortunately never on my car.

 

Just a thought, are you sure its fuel? Could you be leaking coolant in through your intake? I had this familiar problem. I found it when I pressure checked the system, I believe. Good luck.