72' 240 with orig carbs.

There is gas pouring from the rear carb float overflow. Took the float chamber cover off and the float seems to be closing the valve. What could it be?

Thanks for any help you can give.

I would replace the float, I believe it has to be either the needle is not seating or the flaot is heavy or sticking. I would think that if you had too much fuel pressure both carbs would be effected. jlp

... that if the float IS in fact closing the needle and seat that that would stop the flow of fuel into the float bowl. No fuel in = none to run out. Either a stuck needle and seat, foreign material in the needle / seat area, or a sunk float.

Sounds like a job for our JUST SUs video/DVD

Try this --- With the lid off, turn the float bowl lid vertically with the pivot pin up and the pivot hanging. While blowing into the fuel inlet tube move the float toward the lid. If the needle and seat is closing, you can feel the increase in pressure to your breath. If it is closing to your satisfaction then check for sunk float, excess fuel pressure.

As an aside: When you feel the increase in back pressure when moving the float closed that is also your float level. Hold it there and measure. There is a little spring inside the needle and seat that throws any other the method we show on the video into a cocked hat.

Thank you for the suggestions. I appreciate the quick response and good advice.