Voltage drop to fuel pump

[gsitts]

I was troubleshooting the fuel pump (Which was bad) and found the voltage at the connector on top of the tank was 2-3 volts lower than the battery voltage which makes me nervous. This voltage check was made with no connection to the pump so voltage drop should be 0. The PO had allready put a jumper from the ground wire to the tank in an effort to fix it and when I removed the jumper I found the original ground isn't good so for now I put it back. I'd like to correct this before I put in the new pump since low voltage might be what caused the first pump failure. I'd like any thoughts you all might have.
Thanks and happy Thanksgiving.
Gordon
This is on a 1995 D1
Sorry
G

 

[ptschram]

Describe your testing procedure, please.

 

[1bigsnake]

Are you using a digital multimeter or analog?

With a known good ground like a piece of wire right to the negative terminal go through the individual points easily accessible and check for 12v. You should see a drop across one item along the way. Fuel pump relay, inertia switch under left front seat. Wiring harness by the rear wheel

For the ground you can add a new ground to the body, which is what i would do, or with the ohm meter setting check the ground wire in he haness along he way.

 

[robertf]

do you have a windshield or sunroof leak? check the relays on the passenger kick panel for corrosion.

1bigsnake- there is nothing under the drivers seat except maybe a cd changer

 

[gsitts]

Thanks for the answers... As far as continued testing I replaced the pump and started checking the cable from the pump forward and found the connector located in the rear fender well area. I moved it around and got the 13.1 volts I was expecting. I then ran the truck and was continuing my inspection when I touched the connector I had worked on and found it was getting hot. I shut down the truck, cut out the connector and spliced the wires with but splices and taped the whole thing to keep water out. I now have the full voltage at the pump even when it is running. The old pump is dead but I'll probably try to resurrect it for a spare.
Thanks for the answers and the heads up on where the wiring goes
Gordon

 

[VIdisco]

had the exact same problem on my D1, corroded connector.

 

[1bigsnake]

It is in a place where I would rather use solder or butt connector and heat shrink. Definitely heat shrink.

Are the fuel Pump relays and inertia switch under the passenger seat? Been a while