Does anyone have experience with a 1990 Chevrolet P6T van electric fuel pump?

This van has an electric pump in the tank and a mechanical pump on the block. The mechanical pump has a fuel return line which makes me think it's supposed to have both.

No voltage to the tank pump. The fuse block has a 10A fuse labeled tank f/p which is hot.

Also the sending unit doesn't work. I tried some contact cleaner on the wiper arm, no help. It shows open regardless of position.

Having trouble finding parts. I haven't put juice to the pump yet, I was going to replace it as a unit.

Comments and suggestions?