I looked at the service manual and it shows a gismo set for siphoning the gas out of the tank. I made up a gismo set like it but can't get the tube in the tank. It goes down the neck a couple of feet and hits something. I didn't taper cut the end of the tube so mabe it is just hitting a lip where the fill tube and the tank come together. Has anyone had success siphoning the GAL? I want to put fresh gas in for a dyno run and I have nearly a tank full of old gas. Any info would be appreciated.