if you are talking about refueling a generator tank, a 7' piece of 3/8" fuel line, and a squeeze bulb (will have a one way check valve) to prime the siphon line... attach to a double ended barb fitting with a short section of 1/4" or whatever your fuel inlet hose on the generator is...if you remove the barb, you have a 3/8" siphon rig to transfer fuel... not exceptionally fast, but doesn't spark

welcome....