Just feed the pipe down so it drips onto the end of the can! Might not work too well, but doable.
Alternatively, if you want a more expensive and stupid method... Fit an extra bit of piping onto your fuel tank's outlet, and run it into a Y-piece. Make a valve for it which you could move a control for up to your handlebars. run the end to your pipe. Open the valve, and watch the stream of petrol hit your can and burn!
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