I have an 87 Sammy that runs fine on smooth ground. But when you head down the trail and hit a bump or head up hill it dies. No sputter no cough just dies. When I try to start it trys to fire but wont. After a few min of cranking gas pours out of the canaster mounted on the fender well. I have pulled the hose that goes from the carb to the canister and as I crank gas spurts out of the carb connection. I have tapped on the carb just at the port that goes to the canaster and it will stop leaking and start. An ideas? ARussell Dallas