i saw an old surge tank down at the workshop today.
had 5/16 fittings for the surge tank feed and return line, 3/8 feed to the pump and a 1/4 return to the fuel tank. All push on fittings, very simple. Just push the fuel hose on and clamp.
Didnt have any mounts welded onto it, but I'm sure you could get than done easily enough. Interested?