Take the carb off, disassemble it and give it a thorough cleaning,
preferably soak it in carb cleaner. If you don't have access to that use a
can of pressurized carb cleaner paying special attention to all the little
passageways and holes. Then blow it out with compressed air. Check the float
very carefully. Those old mercs use to use hollow metal floats that would
develop pinholes and absorb gas making them heavier. If it is one of the
hollow ones, replace it. Reassemble using all new gaskets and needle and
seat. Be sure to adjust the float according to specs.

"tom" wrote in message
oups.com...
I have a 1965 Merc 35HP outboard. Engine runs fine but gas has started
flooding out of carb intake as soon as gas line hooked up. Any ideas??