1993 Chevy P30 fuel pump help

After checking fuel pump relay and oil switch I found that I had blow an ignition fuse. Once it was replaced I had fuel pump and it started then died. Did that about 3 times then stayed on. Seemed to not be running quite rite then after warming up a bit it was much better. It did stall one time when I put it in reverse. The check engine light was not working because of the blown fuse as well. Still having a problem with the gas gauge reading full when I know it is close to empty. I did test the wire going to the sending unit and it has a little over 8 volts. Anybody know how many volts it should have? Sunday I will finish putting everything back together and take it for a little drive. Thanks guys for all your input it really help me having a list of things to test.