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I am having a hot soak problem with the carbs. When I shut off the engine, I can see fuel dripping out of the accelerator pump nozzles. Not only will it drip, it will actually shoot out as if you depressed the pedal. I think it may be some type of fuel 'boiling' problem. The engine does not seem to be running hot. The fuel is from last October, with Stabil added to it. I am trying to use up the whole tank before refueling(1/4 tank to go). Am I on the right track with the fuel, or am I missing something obvious?
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Re: 57 WCFB Carbs
Often, this problem is the result of one of several things:
(1) The carb's float level is set wrong (too high) leaving insufficient expansion room in the fuel bowl.
(2) The float has a 'pin hole' in it allowing it to 'waterlog' and thereby fail to properly shut off the inlet needle valve.
(3) The engine was repaired with a generic fuel pump having higher than factory spec delivery pressure (somewhere around 4 psi is right) and the needle valve has been damaged causing it not to shut off crisply and the fuel bowl to overfill despite the postion/operation of the float. -
Re: 57 WCFB Carbs
Mike, Beyond what Jack suggested, check to see if your heat riser is stuck closed. That forces hot exhaust gas through the crossover in the intake, just below and between the carburetors. That can cause fuel to boil after shutoff.Comment
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blocking the heat riser crossover in the
intake will also help with this problem.Comment
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Re: blocking the heat riser crossover in the
Clem - Is there a suggested way to block the crossover? In other words, does
someone make a gasket set that is blocked. I've seen the sets with the "small" hole, but none totally blocked. Please help me here, as I agree, that passage should be blocked unless you live @ the North Pole. TIA, DennisComment
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i just used .005 thick stainless steel
shim stock. i would just drain down the rad,crack the manifold bolts and slip the shim stock between the 2 center intake bolts on both sides. stainless steel is the only thing to use as anything else will burn thru.this mod also makes the exhaust sound differentComment
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Re: i just used .005 thick stainless steel
Paragon sells the block off plates part # 9308K. Other vendors should have them too. I put a set in my 56 2X4s and set the choke very light. I still get a fast idle when cold and the choke opens just fine. Make sure you wire the heat riser open. RobComment
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Re: blocking the heat riser crossover in the
Dennis, cross-over block off plates are typically included with the complete engine gasket kits sold by various suppliers. Essentially, they look like a rectangular freeze plug. Also they come in two versions: complete and partial.
The complete plug is solid steel and it fully covers the cross over passageways. The partial plug has a small hole in the center to 'almost' block the passage but leave a reduced hole (1/4-inch or so) to handle initial start-up when the heat riser is closed and/or provide an emergency path should the heat riser fail in the closed position.
Most who buy these gasket kits don't know what these 'extra' parts are and simply throw them away. My guess is any local machine shop that does engine overhaul, can rummage and hand you a set for free...Comment
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