Fuel problem- When restarting hot motor

[jetrod]

Hey, When my engine is hot and then shut off for a short time, then I go to restart it-- the engine quits after about 100 yards. Let it set for 5 minutes or so and it takes off like nothing ever happened!! It acts like the gas shutoff is closed--but but it is open. What the ---?.

[BrianBurkert]

Sometimes in extreme heat, the 10% ethanol fuel boils in the carburetor, causing a vapor lock of sorts. Try turning off the gas valve before you shut the engine down. Let the car run out of gas. When you restart, open the fuel valve and cool, fresh gas should cool the carb down enough to avoid the boiling.

The long term fix is to add some Mystery oil or diesel fuel to the gas/gasohol to raise the boiling point.

If the problem persists, also check for blockage in the fuel line and make sure your fuel cap is venting properly.

[marc hildebrant]

I had a similar problem in Colorado when the air temp was in the upper 90's (most summer days). The problem is vapor lock caused by the fuel boiling in the carb.

Marc

[MrTube]

I have heard of people adding multiple paper gaskets between the carb and intake manifold to insulate it some. Not sure how well it works?

[dmaxweb]

Originally Posted by MrTube

I have heard of people adding multiple paper gaskets between the carb and intake manifold to insulate it some. Not sure how well it works?

Has anyone used a phenolic spacer?

[ford1]

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i have and they work xlnt especially if your using an aluminum manifold, use at least a half inch phynolic bock, also plug the heat cross over passage in the manifold, it runs right behind the carb thru the intake manifold, its used as a heater to warn the carb ib cild weather, but with a flathead its not needed, plug with copper pennies, they fit perfect, dont use the new alloy pennies they will just be eat up by the exhaust gasses

[John Duden]

is there any cork in the shut off valve?

[Tom Wesenberg]

Originally Posted by ford1

i have and they work xlnt especially if your using an aluminum manifold, use at least a half inch phynolic bock, also plug the heat cross over passage in the manifold, it runs right behind the carb thru the intake manifold, its used as a heater to warn the carb ib cild weather, but with a flathead its not needed, plug with copper pennies, they fit perfect, dont use the new alloy pennies they will just be eat up by the exhaust gasses

Where is the heat crossover that should be plugged???

[Benson]

Have you tried gas with no ethanol or lower % of ethanol ?

Any chance you have some winter gas left over from Michigan?

NC has a bunch of stations! Click the "details" tab on right side, not all grades are ethanol free.

http://pure-gas.org/index.jsp?stateprov=NC

Originally Posted by jetrod

Hey, When my engine is hot and then shut off for a short time, then I go to restart it-- the engine quits after about 100 yards. Let it set for 5 minutes or so and it takes off like nothing ever happened!! It acts like the gas shutoff is closed--but but it is open. What the ---?.

[Russ/40]

Originally Posted by Tom Wesenberg

Where is the heat crossover that should be plugged???

He spends a lot of time on the V8 forum. He's confused as to where he is.

[Robert]

BrianBurkert is right on the money. Add a little MMO, ATF, maybe even castor oil (which is my favorite-smells good when it burns) to your gas tank at each fillup. Not only will adding a little oil raise the boiling point of your gasoline to help prevent the dreaded vapor lock, it will also help to lube the top side of your engine. Good luck!!

[ford1]

LOL opps, your right, a senior moment, brain fade, low caffene content, im going back to the v/8 room, lol god what a blunder