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Jim, a couple of things to help you.. The first is: MAKE SURE you cleaned the bowl vent passage (inside top of bowl) clear back to the choke plate area.. If that is plugged is could cause a siphon problem & make a carb act like yours. Next,, pull the float bowl (I know on a D that it usually means pulling that darn carb again)� Then use a small tank of gasoline (or mineral spirits if inside a building)� Then plumb up that tank to the float bowl by itself & watch it.. That will tell the story about your leak as you can watch it.. (you�ll be able to look right into the top of the float bowl as it will work independent of the carb) If the needle & seat are suspect,, pull it back out & place the needle in the seat then suck on the threaded part of the seat (don�t let your friends see you do this),, then when a good vacuum is created just place the tip of your tongue on the threaded end of the seat.. If it is holding good that seat should stay stuck to your tongue for a short while.. If it falls right off your needle to seat is not sealing (kind of common on some newer needle seat assemblies) Or,, instead of using your mouth use a My-Ti-Vac hand held vacuum pump if you have one.. (it must hold vacuum if placed on the threaded part of the seat) If all above good so far,, then suspect the fuel entrance cast iron well (the place the fuel line hooks to) has porosity in it�s bottom (in the rough cast part of the bottom of the well).. I have seem a few of those rust through do to water in the bottom of that well.. At least with that float bowl pulled off & in plain sight you should be able to track the problem down by watching it.. Clooney
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