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Old 04-19-2003, 11:07 PM
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Post small block chevy starts won't run

HI I built a 350ci engine everything new from trick flow aluminum heads to a 700cfm Demon, GM Hei ignition etc.. I started it up for the break in let it run long enought to break in the cam. I had other stuff going on with my car so I left the engine alone for two months. When I went to start it, it would not run. It turns over, but will not stay running. the most I have got it to start for was around 15 seconds. I have 5.5 pounds of fuel pressure @ the carb. My wiring is correct. initial timing is correct. Here is what happens when I try to start it. If I pump the gas for three long squirts, it might fire up, and then seems like it runs out of the inital gas I pumped into it, and dies out. I have tried feathering the gas to keep it running, but it seems like it chokes on he gas and dies out. The floats & idle screws had been set, but I thought possibly that maybe the carb was just a bad carb, So I switched it out with an old 600 cfm holley that had been rebuilt but just sitting around and it acted in much the same way. I have not done a leak down test on it or compression test, and I am afraid of the results. But to me this seems like I do not have enough vaccuum to keep the engine running. to me it sounds like the intial start creates enough vaccuum to work with fuel put in the carb prestart, but will not keep it running. I know I should have compression checked it before asing this question, but I can borrow a friends compression tester until next week or so. In the mean time do you guys have any other poss. scenarios??? thanks
-mike

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Old 04-20-2003, 04:57 AM
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you may have a fuel delivery problem, check your fuel filters ,they be restricting the fuel flow ie plugged or dirty. also check for bent or damaged fuel lines and loose hose clamps or rusted out lines or sending unit.
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Old 04-20-2003, 05:38 AM
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You could try shooting a little carb cleaner down the throat of the carb while someone else starts her. If she's fuel starving a little bit of carb cleaner will keep her running. Good luck!


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Old 04-21-2003, 04:56 PM
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had the same problem and it wound up being a carbon clogged intake manifold <img src="graemlins/evil.gif" border="0" alt="[evil]" /> check up underneith the intake man. under the peice of pop rivetted metal. Buy 2 cans of carb cleaner first. Or better yet, take the intake man.to a machine shop and have it boiled clean. <img src="graemlins/pimp.gif" border="0" alt="[pimp]" /> if you do it yorself, use a rubber mallot and bang all around the intake. bang a bit and spray a bit and repeat <img src="graemlins/crash.gif" border="0" alt="[crash]" />

[ April 21, 2003: Message edited by: ap0001 ]</p>
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