The hard fuel line dose not thread directly into the tank
Depending on how you decide to run your line you will need a fuel hose just off the hard line
...link... The early AD's use a shut off valve on the bottom of the tanks. The fittings on the valve make the transition from inverted flair to pipe.
You need a hose because the cab flexes
The proper sending unit and hose for your year will get you there.
If you do go with and under tank set up you will need the valve
...pic... ...pic... and/or this hose
...link...where would i get one of those shut-off valves from? looks like you did a lot of rigging to get that together. this would allow me to hook the main line to the drain plug in the bottom of the tank?
after reading cletis' reply, i went back and saw those flexible hoses, but they only come in 7.5" or 4 3/8" lengths.. i measured the top of the tank (at sending unit) to the floor in the cab where the drain plug sits and it's atleast 12" tall. even if i buy the sending unit with pickup tube and enough flexible hose to reach the main line, the drain plug would have to share the floorboard hole with the flexible hose.. i didn't see any other holes in the vicinity; that seems a little crowded.
the factory assembly manual wasn't much help, in there it almost looks like there's supposed to be a hard line coming from the sending unit down and then a flex hose right at the grommet-hole to meet the main line under the cab.
