Bike leaking fuel

I have a 1981 gs1100 sometimes when I am done riding for the day it drains
my whole fuel tank out on the ground. I am somewhat mechanical, but am
stumped....I thought the floats were sticking, so I disassembled the carbs
and cleaned them...they were dirty big time. Still the same problem.....I
have not been able to see were the fuel comes from as every time I catch it
it is too late the tank is drained and there is a big puddle under the
bike.....any ideas? Happened only 7 times last year, and I ride lots....so
not to often. It also seems to flood sometimes when riding it....(it bogs
so to speak) I also floated all of the floats to check to see if they were
shot no luck.
Thanks in advance to all that help
Greg Hope
Member of Mta alberta

 

Does your bike have a petcock between the tank and the carbs? If it
does, does it have a vacuum hose attached to it?


Matt