80 Fuel Tank

[Nvbowtie]

I am trying to figure out what sending unit to buy for my 80 tank, I no longer have the vapor canisters.

And the sending units are cheaper with out the extra outlets.
I just need one outlet on top.

There is a different part number for each side and the drivers side is 5.00 more ?? I don't get that, if the tank is the same ??

So what year sending unit should fit my 80 tank and be the same fuel capacity ?

Also- What is the capacity ?

Background: dual tanks, the tanks- look identical. putting back the pass side only.

[79BIG10]

Should need two outlets I would think. One for fuel out and one for fuel vent. On the driver side versus passenger not sure why either. The capacity is 16gal for SWB and 20 for LWB "most of the time". I've heard that some trucks came with different gallon sizes on some trucks like 16 gal. on LWB but I think this may have been a special order or just the factory workers recovering from a hangover on the weekend and grabbed the wrong one

On the year I think they should be close until 87? when the wiring changed. This is also when the wiring for the valve from driver to passenger changed as well.