Problem with Edelbrock performer carb going dry after a few days - Page 2 - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #16 of 20 (permalink) Old 09-20-2012, 09:13 PM
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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".

GET OUT & VOTE THIS NOVEMBER!!

Last edited by mavman; 09-20-2012 at 09:16 PM.
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post #17 of 20 (permalink) Old 09-21-2012, 03:11 AM
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Re: Problem with Edelbrock performer carb going dry after a few days

add a heat shield (summit/jegs ect) and a wood or phenolic spacer ... and try to use non oxy fuels.... This cured my problems ...
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post #18 of 20 (permalink) Old 09-21-2012, 05:56 AM
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Re: Problem with Edelbrock performer carb going dry after a few days

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Originally Posted by bartlettracing View Post
add a heat shield (summit/jegs ect) and a wood or phenolic spacer ... and try to use non oxy fuels.... This cured my problems ...
Heat wrap/sleeve on the fuel line from the pump to carb and a Phenolic spacer have fixed this problem on both my cars with Edelbrock carbs.

Jet
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post #19 of 20 (permalink) Old 09-22-2012, 07:14 AM
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Re: Problem with Edelbrock performer carb going dry after a few days

Before anything, try a wooden clothesline clip on the fuel line (pump to carb). If it solves the issue, then heat wrap the line.
Also, when you stop and kill the engine, if the fuel is evaporating, you could hear it within about 2-3 minutes.
A half inch phenolic spacer is only $30 and a great investment imo.
Some 390's have sealed fuel pumps, which do die in funny ways. When it is running you can sometimes see fuel come out of a vent on top of the pump, meaning the diaphragm leaks.
Last ?, is the gas cap really stuck on sometimes, or seem to have some pressure released when you open it?
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post #20 of 20 (permalink) Old 09-22-2012, 11:45 AM
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Re: Problem with Edelbrock performer carb going dry after a few days

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Originally Posted by captionwell View Post
Before anything, try a wooden clothesline clip on the fuel line (pump to carb). If it solves the issue, then heat wrap the line.
Also, when you stop and kill the engine, if the fuel is evaporating, you could hear it within about 2-3 minutes.
A half inch phenolic spacer is only $30 and a great investment imo.
Some 390's have sealed fuel pumps, which do die in funny ways. When it is running you can sometimes see fuel come out of a vent on top of the pump, meaning the diaphragm leaks.
Last ?, is the gas cap really stuck on sometimes, or seem to have some pressure released when you open it?
clothesline clip , what's the purpose of placing on fuel line ? what material is best, wood or plastic or other ?
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