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Question about fuel boil

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Old Aug 17, 2008 | 08:37 AM
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Default Question about fuel boil
For some reason, my 71' 350/270 has started to boil the fuel in the carb bowl after turning it off. I still have gas in the tank from last fall, it it possible that I have "winter blend" fuel which will boil easier or do I have some other problem? Never did this before.
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Old Aug 17, 2008 | 09:04 AM
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From: eville in
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its stale by now ,,top it off and check
and how hot is it getting ?
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Old Aug 17, 2008 | 09:13 AM
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If you have the stock intake manifold and stock exhaust with the heat riser valve on the passenger side the valve might be stuck. I believe the purpose of that valve is to divert exhaust gas through the intake manifold near the carb to aid in cold weather driving. When the engine warms up the valve is supposed to close off the passage.



Rick B.
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Old Aug 17, 2008 | 09:17 AM
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Originally Posted by Duke94
is it possible that I have "winter blend" fuel which will boil easier
Yes I've seen it before.
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Old Aug 17, 2008 | 09:44 AM
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Originally Posted by comp
its stale by now ,,top it off and check
and how hot is it getting ?
The engine runs cool. It has stock manifold and exhaust. I'll fill up with fresh gas and check the heat riser.
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Old Aug 17, 2008 | 09:45 AM
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From: eville in
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Originally Posted by Duke94
The engine runs cool. It has stock manifold and exhaust. I'll fill up with fresh gas and check the heat riser.
you checked the coolant level to ?
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Old Aug 17, 2008 | 10:58 AM
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Originally Posted by comp
you checked the coolant level to ?
Good idea
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Old Aug 17, 2008 | 07:25 PM
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Ethanol?
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Old Aug 17, 2008 | 08:20 PM
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Default Try a thick carb gasket.
Originally Posted by Duke94
For some reason, my 71' 350/270 has started to boil the fuel in the carb bowl after turning it off. I still have gas in the tank from last fall, it it possible that I have "winter blend" fuel which will boil easier or do I have some other problem? Never did this before.
Even Qjets will boil fuel from what is called "Hot Soak". Thats why Holley sells a heat shield for thier carbs. My Qjet runs fine with the extra thick gasket that lars sent me - man its like at least a 1/4" thick. This could be the cheapest fix for ya.: :

Hope this helps,
cardo0
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Old Aug 19, 2008 | 06:52 PM
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I have the thick Lars gasket as he rebuilt it. I just filled it up with 1/2 tank of fresh gasoline and that seems to have solved my problem. Thanks for the help
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