gas tanks and fuel lines

[chrismoore701]

I started cleaning my tanks to paint and reinstall tonight on my 79 stepside. There was a little rust, but looked great, well except for where the bands go around. I took a pick and poked a few holes with no trouble. looks like new tanks. Question 1 where is the best place to by 15 gal tanks. 2nd question. I have 3 lines coming off the sending unit from the tank. I believe one goes to the fuel pump, and one goes the the canisters for emissions what about the third line. I hear I do not need to reinstall the canisters for emisions, so I I gues I need just a 2 line sending unit. so that still leaves the question where doe that other line go to? I looked at my dissasembly pictures and do not have one for the area. thanks for your thoughts