carb puzzle?

["Gary H." <spigot2039@xxxxxxxxxxx>]

Hi all,

A fellow is trying to get his 1965 Coronet's Poly 318 carb to stop weeping gas on the manifold after the engine is hot and the car is shut off. He bought a re-manufactured carb from Holey and it is doing the same thing the old original carb was doing. It is a Ball & Ball 2 barrel manufactured by Carter. The model is the BBD-38445 for a 273 with automatic trans. 

He talked to Holley's technical help about fuel leaking onto the intake manifold after the engine is shut down for a short time, maybe from the throttle shaft on the drivers side of the carb. They said it was either 1) excessive fuel tank pressure caused by possibly a blocked vent tube;(this is not possible as the car's fuel cap is loose due to someone messing with it previously); or 2)a problem with underhood heat causing the pressure in the carb to build up and force fuel into the throat while the engine is not running and drip onto the the plates and then onto the shaft. The fuel line from the fuel pump could be getting too much heat from the exhaust manifold.  The Holley technician suggested a phenolic spacer under the carb to act as a heat sink.

I suggested he make sure the fuel line is not too close to the engine. Then, if that does not help, try to insulate the fuel line from the pump to the carb through buying some generic insulation material at a NAPA type store or street rod vendor. Or first just wrapping a bunch of aluminum foil around the fuel line and wrap some aluminum tape over it to keep it in place and see what happens. At least for a test.  Or some other method to shield the fuel line from the heat coming off the intake manifold. 

I suggested he could build a heat sink / carb spacer out of MDX plywood like Rich K. and then a fuel pump heat shield like Rich did too.

Any thoughts?

Thanks,
Gary H.

 
  


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