If there is a plastic or rubber fuel line involved as on my cars, just squeeze them shut with a spring clamp. They sell these wherever they sell tarps, and they last forever and don't even cost much.

Harbor freight sells assortments of them at the best prices that I have heard about.

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Semibodacious Transmogrifications a Specialty

1990 300D 2.5 Turbo sedan 171K (Rudolf)
1985 300D Turbo TD Wagon 219K (Remuda)

"Time flies like and arrow, yet fruit flies like a banana"
---Marx (Groucho)