I was watching huevos 6, and on the baja race, they had huge gas cans which would suck down on the top of the cap and pour gas in, no spilling or anything as the suction thing would stop it... as it was sucked down.

what are these called and where can i get them?

 

they are expensive...really expenive...Id ont know what they are called tho..

 

"Dry Break" fittings and "Dump Cans"

http://www.imsproducts.com/ Thought IMS would have some info, but didn't find anything specific.