I used an 8 gal. pony keg in my 40 panel truck back in the 70's. When I first built the truck I had a Hilborn injected 331 sbc in it. I had a regular tank in the back with electric fuel pump to the keg in front of the radiator. Then hooked the belt drive fuel pump to the keg. Worked great, but probably not a very good idea to have a fuel tank hanging in front of the radiator on a street vehicle. Looked cool at rod runs. Mechanical injection wasn't very practical for street use, so replaced the injection and Keg w/carb .

Thought I had pic. of "Keg" installation, but this is all I could find.