This exercise stems out of trying to find the correct fuel sending unit for a 1986 Toyota 4x4 SR5. It is a RN64 VIN truck that started life as EFI, but was changed to a carb by the time I bought it.

I have a sneaky suspicion that the gas tank has been changed and that makes it a challenge to get the correct fuel sending unit.

This is the general picture I can find of the correct tank.
http://www.autopartswarehouse.com/sk...gs+Best+Seller

Notice that the two holes in the top are rather close together?

The tank currently bolted in to the truck looks like this one though.
http://www.autopartswarehouse.com/sk...gs+Best+Seller

Notice that the holes are farther apart.

I really don't know if it matters when searching for a fuel sending unit, but there are several fuel sending units listed in the parts manual.

Is anyone a fuel tank / sending unit expert on here?