I don't think you can get the tank to do anything using hot water and a bicycle pump. Unless you had a hundred pounds behind it.....?????

 

I'm an auto tech, and have heard stories of guys blowing compressed air into the fuel system to find evap leaks then boom. I've learned to be weary of fuel vapor I guess haha.

 

Couldnt one just empty the fuel out of the tank and drop a match inside the tank. I promise the tank will expand

 

i think i got it.
im gonna run a new fuel line to the carb. its gone 3/4"ID. and its gonna run from the tank down the frame, along the swing arm, use some brass fittings to make a 180 back along the swing arm up under the seat out to the rear fender more brass fittings back towards the motor into a brass tube wound in a spiral and then reduced to 3/8" and into the carb. should be good for at least another gallon.

 

Thats my "patent pending" idea! Back to the drawing board.