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04-25-2014, 08:44 AM
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CC Member
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Join Date: Sep 2007
Location: Marlboro,
NJ
Cobra Make, Engine: Contemporary Cobra
Posts: 921
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Not Ranked
Webers weeping
On 3 of the carbs one barrel of each carb is dripping fuel into the barrel after the motor us shut off. This is a new problem... Anyone know whats going on?
Jon
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04-25-2014, 08:53 AM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-289 FIA, 65 Sunbeam Tiger, mystery Ford powered 2dr convertible
Posts: 12,685
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Not Ranked
Quote:
Originally Posted by saltshaker
On 3 of the carbs one barrel of each carb is dripping fuel into the barrel after the motor us shut off. This is a new problem... Anyone know whats going on?
Jon
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User error, I suggest a Holley 650DP 
__________________
Instead of being part of the problem, be part of a successful solution.
First time Cobra buyers-READ THIS
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04-25-2014, 10:33 AM
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CC Member
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Join Date: Feb 2012
Location: Redondo Beach,
CA
Cobra Make, Engine: 331 SB, AFR heads
Posts: 75
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Not Ranked
There are several potential causes for this type of problem if you have not experienced it previously. 1) Fuel pressure regulator malfunctioning and increased pressure seen at the carbs, 2) Different gas formulation with increased content of alcohol resulting in fuel percolation after hot shut down, or 3) Higher ambient temperatures than previously experienced.
Since you mentioned that 3 out of the 4 carbs are exhibiting the symptoms, I have assumed that it is not a mechanical problem inside the carbs or foreign matter getting into your float seats.
Let me know if it is any of these causes. Just curious.
John
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04-25-2014, 11:54 AM
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Senior Club Cobra Member
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Join Date: Dec 1999
Location: Edgewater,
FL
Cobra Make, Engine: ERA FIA, BOSS 351C/Webers
Posts: 1,304
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Not Ranked
It's that garbage they sell for gasoline these days with the Ethanol in it. The gas with Ethanol has a lower boiling point than pure gasoline, so in a short "hot soak" the gas with Ethanol boils and percolates out of your carburetors, dripping raw fuel into your cylinders.
The effect can be minimized by using marina gas (it has no Ethanol) mixed with race gas. So far, 90 octane is the hottest marine fuel I can get around here, so I mix that about 75/25 with 108 octane race fuel - seems to help. Didn't have this problem back in Detroit when I could get gasoline that was not watered down with Ethanol.
You might also try opening your hood immediately after a run, and leave it open for awhile while the engine cools down. My next trick will be installing the phenolic spacers I bought for my Webers years ago.
Jeff
__________________
CobraJeff
ERA P 202
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04-25-2014, 04:32 PM
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CC Member
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Join Date: Sep 2007
Location: Marlboro,
NJ
Cobra Make, Engine: Contemporary Cobra
Posts: 921
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Not Ranked
Your Right!
Ethanol ate the fuel line and the needle seats had to be cleaned....
Thanks
Jon
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04-25-2014, 06:03 PM
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CC Member/Contributor
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Join Date: Feb 2000
Location: Greenville,
SC
Cobra Make, Engine: 70 Shelby convertible, ERA-289 FIA, 65 Sunbeam Tiger, mystery Ford powered 2dr convertible
Posts: 12,685
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Not Ranked
Quote:
Originally Posted by saltshaker
Ethanol ate the fuel line and the needle seats had to be cleaned....
Thanks
Jon
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See, user error  
__________________
Instead of being part of the problem, be part of a successful solution.
First time Cobra buyers-READ THIS
|
04-26-2014, 12:50 AM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
Quote:
Originally Posted by saltshaker
Ethanol ate the fuel line and the needle seats had to be cleaned....
Thanks
Jon
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Are you going to replace all your fuel hoses now Jon?
__________________
Gary
Gold Certified Holden Technician
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04-26-2014, 06:01 AM
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CC Member
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Join Date: Sep 2007
Location: Marlboro,
NJ
Cobra Make, Engine: Contemporary Cobra
Posts: 921
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Not Ranked
Fuel lines
Yes, i had hard lines to the pump and replaces all of them after the pump
Jon
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