Quote:
Originally Posted by Midcont
The car has a small block 351w-427R.
It starts up immediately when cold. When warm, sometimes two or three attempts with a couple of seconds of cranking, unless I catch it just right with a few pumps on the gas pedal and just enough pressure on it while I start.
A new fuel pump was installed at the beginning of summer. I don't really remember having this issue before it. The mechanic says its due to the high levels of ethanol in the fuel. It took all summer, but I last week put in 5 gallons of 104 octane and filled the rest with 94 octane to see if this rectified the issue. It didn't.
I've also read it could be the starter not working well when warm.
Any thoughts or suggestions?
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When you write 'warm' do you mean 'hot' or normal operating temperature?
Do you have an electric fuel pump or mechanical?
At this point my guess would be vapor lock or fuel percolation. The area around the carburetor is hot enough to vaporize the fuel.
One solution is an insulating spacer between the carb and intake manifold. Electric fuel pumps seem to be less prone to this than mechanical pumps.
Probably worth a few minutes to check out this thread:
Holley hot stop fuel perc issue