Update,
There is still an issue w/ filling the tank, getting the overflow air out of the "burp" hose while the fuel fill falls down the big fill hose. I haven't had time to mess w/ correcting it, other than making the observation:
If the truck is parked nose down, tipped to the drivers side, then the burp hose drains out into the tank, and air is able to be passed. but if it parked the other way, then it is necessary to reach under the truck and grope the hose to get the fuel puddle out of the hose so the air can flow out. The burp hose needs reconfigured to relocate the return line tee fitting closer to the tank and elevate the run of the hose so fuel doesn't puddle in it.
Other than that, the fuel gage seems to work, it's been driven to indicating empty and then filled up a couple times now. Takes 34 gals or so, which seems consistent w/ the stated 38gal capacity and the pessimistic Toyota gage.
As soon as the fill problem is worked out, then the project is finished.
There is still an issue w/ filling the tank, getting the overflow air out of the "burp" hose while the fuel fill falls down the big fill hose. I haven't had time to mess w/ correcting it, other than making the observation:
If the truck is parked nose down, tipped to the drivers side, then the burp hose drains out into the tank, and air is able to be passed. but if it parked the other way, then it is necessary to reach under the truck and grope the hose to get the fuel puddle out of the hose so the air can flow out. The burp hose needs reconfigured to relocate the return line tee fitting closer to the tank and elevate the run of the hose so fuel doesn't puddle in it.
Mace, the FJ62 pump is in the tank. If installing the 74-80 ford tank, the easy solution would be an external universal 35PSI pump. The slightly more expensive/difficult solution would be to use the 38 gal tank for 85-newer Ford truck w/ EFI, using the stock Ford in-tank pump.