My buddy and I were working on my bike and needed to have have it run without the tank being attached so we could see what the carbs were doing. After a trip to Lowe's (or Home Depot) and Walmart, here is what we came up with. Just thought I'd share this with you guys as it took us a bit of creative thinking to come up with the solution and it may help someone else down the road.
Basically we attached three brass nipples to a brass T then cut the end off the nipple of a baby bottle and Viola, one external fuel supply.
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I did mine like tha once when iI had to synch my carbs. Think I just used a funnel and poured fuel in it as I needed it
Nicely done.
ON a GS you could just put a fuel line on the petcock, and use a feed bottle (Lucas oil comes in perfect bottles).