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My Carb is Acting Funny...Help!!!

454 Views 7 Replies 2 Participants Last post by  DanStew
I think the accelorator pump is going on my rochester 2g. It takes about 8 pumps of the petal to start it, sometimes more. Is this the Carb fuel accelorator? If i get a rebuild kit for it, will it include the parts to fix this? Or is this a float problem? I have a jeep run this sunday and want to rebuild the carb tomorrow or maybe replace it. Can anyone help me.
Thanks for those who can help me.
Dan Stewart "Caloosa Jeepers" member

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Cold start, warm start, both? The pumping to refill the float bowl sounds all too familiar a Rochester Q-Jet problem, leaking well plugs is the problem on those, epoxying the well plugs is the cure. Not sure about a 2 bbl. Rochester, but it could be the same kins of thing.

Brad (from the 4 Wheeling center of the universe, 4 corners USA)
usually it is a cold start problem. I at first thought it didn't like cooler temps, but after pumping 8 times i think it is something else. where are the well plugs at? i am not familliar with carbs, they seem to be black magic for me, but i need to learn.
Dan Stewart 1963 CJ5 "caloosa Jeepers" member

That's not really the purpose of the accelerator pump. It sounds more like you might have a choke
problem. You should be able to take the air cleaner off and work the throttle and see the pump squirt
a stream into the carb if it's working. The real purpose of the pump is to prevent a power sag durring the
first second of quick acceleration. Since you didn't mention a problem here, I would guess the pump is
working. To answer your question, yes the parts come in the kit.

I am not running the choke. i took off the automatic choke, and put on a cable one, then took that off. The pump squirts, but it just seems weird for pumping it 8 times to get it started. I noticed the pounding of my jeep in the woods lossened up the richness screws before, i rechecked those and they are fine now, could the pounding do other damage inside it?
Dan Stewart 1963 CJ5 "Caloosa Jeepers" member

Like I said, the word Rochester brought back memories of 1970s and early 80s GM V8s, usually equipped with a Rochester Quadrajet, probably one of the best but most complicated carburetors ever made. Tiny primaries, giant secondaries, sounded good with an open air cleaner. I'm rambling, worked on a bunch of those years ago, the well plugs are in the bottom of the float bowl, but like I said, I'm not sure if the 2bbl. has them. CJ7Taz mentioned the choke, that would be my first guess on cold start problems.

Brad (from the 4 Wheeling center of the universe, 4 corners USA)
No choke at all, no wonder it won't start cold. The reason you are having to pump it a bunch of times is you need a rich mixture to start it, you are essentially getting that by flooding it. HOOK UP THE CHOKE! /wwwthreads_images/icons/shocked.gif

Brad (from the 4 Wheeling center of the universe, 4 corners USA)
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I have had the choke off for about 2 years now. It juct started to act up more in the last 3 months. I hope that will fix it. I mean it is florida and the temps are not cold. maybe the low 70's if i try to start it.
Dan Stewart
1963 CJ5 "caloosa Jeepers" member

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