Join Date: Jun 2001
Location: 35.753983 N, 91.634603 W
Re: Problem with Edelbrock performer carb going dry after a few days
Completely normal for fuel to evaporate in a day or so. Especially on an edelbrock carb. One, the bowls don't have a big capacity. Two, they are RIGHT on top of the engine/manifold-and they run hot anyway. Once you shut it off (hot engine), the fuel is already evaporating-and quickly. Most edelbrocks will boil the fuel on a hot engine that isn't running. Usually it's not a huge problem but like with a big engine and a really hot manifold, with the carb sitting RIGHT on the intake (with a gasket between the intake & carb-but no insulating spacer), they'll boil to the point of making the engine run like poopie.
Take a quart jar and fill it 3/4 full of fuel, let it settle a minute and then mark the level of fuel in the jar with a marker. Let it sit with the lid off for a day or so and watch how fast it evaporates. I have proven this at work with my coworkers, although all I have is a pint jar. A pint almost evaporates overnight, and what's left smells like....well poo I guess you could call it. Not sure what it smells like. Old gas I guess. Also E-10 and E-15 is hydroscopic. Just like our methanol bottles-we have to keep them totally sealed or they'll suck water out of the air.
Couple things can be done if it eats at you. An electric fuel pump...turn the key on and it pumps fuel into the carb so you don't have to crank so long. A heat insulating carb spacer helps if you have the room for it. And sometimes the air filter's shape/element design/etc is conducive to allowing more vapors to escape. Usually it's the tiny marine style "filters"...aka "flame arrestors".
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Last edited by mavman; 09-20-2012 at 09:16 PM.