Built one back in the 70's,BUT, marraige,a house and kids,well you know what happened 
The first one I used a "gas tank" from the beetle I cannabilized.. I cut the body,at the door frame and went from there. I see a lot of the V.W. trikes with 6 gallon gas tanks,which at the most run 180 miles til empty. I plan on using a stainless steel 15 gallon beer keg as a fuel tank. Enough of plans, what I am asking,is putting a "sending unit" in the keg and setting it "horizontal" and wondering where I can get a "filler" cap? Researched a lot of sites, but, have been hitting on ZERO. Any and all info would be greatly appreciated.
The first one I used a "gas tank" from the beetle I cannabilized.. I cut the body,at the door frame and went from there. I see a lot of the V.W. trikes with 6 gallon gas tanks,which at the most run 180 miles til empty. I plan on using a stainless steel 15 gallon beer keg as a fuel tank. Enough of plans, what I am asking,is putting a "sending unit" in the keg and setting it "horizontal" and wondering where I can get a "filler" cap? Researched a lot of sites, but, have been hitting on ZERO. Any and all info would be greatly appreciated.