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rebuilt my 4150 holley couple weeks ago,and when you shut down motor fuel seeps out venturies,
1. replaced needle and seat twice
2. mechanical fuel pump
3. float level perfect (fuel just seeps out bowl plugs at idle)
4. puzzled JEFF
 

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you might have the same problem that i had on my 750- percolating fuel. do a search, you might need an insulating spacer. from what i can tell, it has stopped my problem- fuel boiling out of the carb once i shut the car off and the carb heats up. I am going to write my results in that thread once i have spent more time with the car.

this was my thread:
http://www.chevelles.com/forums/showthread.php?t=220097&highlight=fuel+boil
 

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66 El Camino 57 Chevy pickup 2004 Tahoe
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Yes, check that thread. I just threw in a little piece too.
 

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Have you checked the fuel level in the bowls when the engine is shut off and the seepage occurs? I also seem to have post shutoff flooding and am exploring the fuel tank pressure issue that's been discussed before -- I'm wondering if fuel tank pressure might be pushing fuel into my carb after shutoff. I think mine's due to the past owner deleting the vapor canister and plugging the line.
 
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