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Fuel leakage at carby on V12


Freshman Member
When my electric fuel pump is running and the engine isn't, fuel is running out of all 4 carburetors (stromberg cd 2). It apears to be flowing out of two small holes which are located above main air in flow hole. The gasket between the air cleaner housing and the carb' body has holes in it which allow these holes to be seen. I don't think all four needles would be leaking at once?

John S Farrington

Jedi Warrior
In order for this to happen, the needle valves in the float are letting the gas over flow the chamber. I can think of reasons for all four to flood. 1. The fuel pump and/or regulator is deriving too much pressure and causing the valves not to close. 2. All four carbs are flooding due to a lot of debris preventing the valve from closing. It would seem illogical that all four floats would sink or become inneffetive or the four valves would fail at the same time. If your pump is deriving not more than about 3 psi, then you are going to have to look at the floats and needles. What kind of pressure regulation do you have in this car? Is it standard factory or something special? Is the car an E type?

Izual Angel

Jedi Trainee
Wait a sec... do you mean those small rectangular holes directly above the throttle bore?

John S Farrington

Jedi Warrior
I am not rreferring to them. From what you said it sounds like you are flooding gasoline out of side ports that are circular. about the same size as the input to the carbs from the fuel pump. These side ports vent the fuel chamber bowl and will allow gasoline to exhaust when the fuel bowl is flooding. If tdhese are not the ports, then where is gasoline coming from?

John S Farrington

Jedi Warrior
PS,I have just reread your posting and understand now where the gas is going. I have never hear of this one and will have to do research to understand how this is happening. It is a very odd situation.
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