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66-96 Ford Broncos - Early & Full Size
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B-Co Kid

Carb issue

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Posted (edited)

5.8L/351W; C6 Trans; Edelbrock 650 Carb; 

Finally got the cooling system in check, and when trying to start'er up after sitting for about a year, the carb is leaking from the top and I'm not sure why.  Never had an issue with the carb when driving before the downtime.  When cranking, the carb is spitting up gas from the area indicated by the green arrow.  Please help!

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Edited by B-Co Kid

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Yo B,

One possibility is "float needle valve is responsible for regulating the flow of fuel into the float bowl. When the tip of the valve becomes worn or debris prevents the closing of the valve, fuel flows continuously into the bowl thus flooding the engine. Under severe conditions gas may soak the air filter or overflow out of the carburetor and onto the ground while parked.
 

Worn or stuck float valves are very common following prolonged storage or when gasoline has been allowed to sit inside the carburetor and begins to lacquer with age. Another common cause is the use of fuel containing any Ethanol. Many states now include anywhere from 5-15% Ethanol which can be detrimental to certain rubber parts over time.
cvp_accel_diaphragm.jpg
If the fuel in your state or region contains more than 10% Ethanol you may need to replace certain soft parts more often, including the float needle valve and the accelerator pump diaphragm." by CV Performance.

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