Black Smoke

[Alan J.]

Re: Black Smoke

Jim, did you get a response on the "float bowl empties after a few days of sitting..." issue? I've got a 3721S AFB that exhibits similar problems to yours. I always guessed that the emptying problem and the rich operation were related -- I think a porous casting is the problem. I'd be very interested in what you learn.

Alan Johnson

[Jim Grantham]

Re: Black Smoke

There is something related here. The carb has small access openings in the bowl that are sealed and crimped shut. I looked at these when I had it open for overhaul and they looked okay but I didn't fill the bowl and look to see if it was leaking. I should have since this problem has always been with the car since I had it (15 years). I will let you know what I find.

[Grant26602]

Re: Black Smoke

Jim,

I have a 65 with a 3721S as well, and experience a similar problem when the car is left to sit for a day or so. It can take up to ten or fifteen pumps of the gas pedal to get it to start after such a period. I also notice a strong gasoline smell in the garage after a drive, but can find no eveidence of gas leaks etc. My 3721S was used when I bought it (in 1987) and has not been rebuilt or otherwise touched (other than to set idle/mixture etc.). It runs fine overall, but I think it's probably a little on the rich side of settings. I look forward to hearing what you ultimately find is the problem.