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Old 08-15-2010, 12:22 PM
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vapor lock? carb?

We are running a new motor in our 1958 Impala and having problems when temp gets above 180, runs smooth and ok below 180. It seems to be running out of gas or even missing, have to feather the gas to keep it running. When revved up it died and we had to restart back up, but it ran pretty bad after that. When it is cooled down starts and runs great. The weather has been really hot and was not sure if this problem is a heat issue or fuel issue carb or??? Temp never goes above 200 so radiator is doing it's job.

454 bored 30 over with aluminum
demon 750 carb
holly mechanical high flo pump
fuel line is running between the alternator and the block

Any ideas are greatly appreciated. We were down in Reno this last week and it is also pretty hot here 95 out, so we are going to wait until the weather cools down but want to be able to drive even in the hotter weather. It never over heated and ran great as long as the temp was not above 185 or so.

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Old 08-15-2010, 12:36 PM
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Um, that's weird. Maybe the carb is getting to hot. When this happens, try cooling the carb of with some ice something and see if it runs alright afterwards. You may need a spacer.
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Old 08-15-2010, 12:54 PM
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Block off the exhaust heat riser passages at the intake manifold gasket.
Install a wood carb spacer. Install a heat shield to shield the carb fuel bowls from intake manifold runners heat radiation. (holley)

Move the fuel lines away from any all heat sources and or wrap them to eliminate the fuel lines from absorbing engine and exhaust heat., especially the exhaust.
Install a heat isolator mounting gasket on the mech fuel pump http://www.sealsit.com/fuel.asp
Install a electric "pusher pump" at the tank to pressurize the fuel line from tank to mech pump to eliminate vapour lock. Check your ignition timing mechanical and vac advance for proper function.
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Old 08-15-2010, 12:56 PM
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I would check the fuel pressure 1st, check it when its cool n leave the gauge in n then when hot.
If that checks out ok you might wanna try what bigdog suggested, I always like to run an insulating spacer between carb and manifold.
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