Posted by Bob M on January 02, 2012 at 20:41:50 from (67.240.168.45):
This one has me baffled...
Got the Bendix carb off a friend's recently purchased 140. He brought it to me complaining the carb slowly drips gas from the weep hole in the air inlet when shut down.
When I opened the carb I found it absolutely pristine inside - not a trace of varnish, dirt, etc. It appeared to have a new float needle/seat assembly. However I installed a new needle/seat and bowl gasket, checked the floats for binding/leaks (there were none), checked the float level (it was in spec) and put it back together.
When installed back on the tractor, the engine started and ran perfectly. However a few minutes after shutdown it started the slow drip again, just like before.
I set the float level 1/8" lower but found the bowl would not fill so the tractor could not be started. Bringing the level up 1/16" got it to fill again, but once again the drip returned.
I've swapped back the old needle/seat; it still either leaks or won't flow gas depending on the float level adjustment.
When it does drip gas, it overflows out tip of the main nozzle beneath the throttle plate. Fuel is NOT leaking from a bad nozzle gasket, a crack in the bowl casting, etc
Any thoughts to what the problem might be are appreciated!
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