A trick I have used occasionly to get rid of bad gas, etc. is to remove the line from the fuel filter on the side going to the engine. Place a hose over the end of the fuel filter and run it into a 5 gal gas can.
Borrow or beg a hanheld engine analyzer. Run the fuel pump test to empty the gas tank completely by using the electric pump in the tank. I was able to virtually empty the tank and refil with fresh gas with a cleaner for good measure and never had a problem again.
Regards,
Bob T.
