Sorry for posting on the Triumph forum for my old Ford truck, but like I said I could not find an answer. I was desperate and totally psychologically and engineeringlly dependent on you guys. I just figured it out on this old truck. The tank feeds from the top and this little rubber hose at the bottom under the door had broken. Heck, I bought this truck in 1975 one owner and have put a couple of engines and trans over the years in it and just assumed the tank feed was at the bottom of the tank with a vent coming out the top like an old British car. I unhooked the presumed vent line at the top of the tank and thought that is odd this is a sealed fitting. Next, I went under the truck and was going to unhook the line that I assumed was on the bottom and could not find one. Then the light came on, and I thought this is a clever idea have the feed at the top of the tank. If the fuel line breaks, the fuel will not run out. Why didn’t Triumph think of this? Old Henry Ford was a smart guy. This fixed a riddle because I was getting poor gas mileage and it was getting hard to start. Fortunately, I only drive it a few times a year.
Peace out steve