If your GP fuel tank is of the older type with the white stopper - DO NOT USE IT FOR GAS - regardless of what GP says. I used one and it leaked gasoline inside my spacewalker. Good thing the fuel tank compartment was fuel-proofed. Took 3 weeks for the gas smell to dissipate though. GP has made several improvement on their tank design, and the new ones have a compression-fit stopper like everybody else's tanks. I don't even bother using my old GP tanks for glow fuel either. They are not worth the risk of another fuel spill.