:) Don't know if anybody else has used this trick to clear fuel lines or to draw new fuel after a lay-up? Source a "priming bulb" as used on outboard engines and use it the same way to draw the new fuel from the tank to the fuel filter & pump - far better than trying to suck it through!! Since the "priming bulb" is effectively a non-return valve, you can blow fuel/air back down to the tank as well, the sound of bubbles in the tank will confirm a clear line ! ;)