Re: Fuel sending unit does not work in 72
I think you guys are making this more difficult than it has to be....
The very basics on troubleshooting.
Flip down the rear license plate/gas filler door. Looks towards the driver's side. You should see a tan wire, there is a rubber "boot" that splits the wire between the sending unit on top of the tank, and the rear harness in the trunk.
Pull the boot apart. Now stick a piece of wire in the end that lead up into the trunk. Touch the other end of your test wire to a GOOD CLEAN METAL GROUND.
Have an assistant in the car turn the key to "ON". The gauge should go to "E".
Now have them watch the gauge as you disconnect the wire. The needle should quickly move to way past "F".
If it does this, the gauge is GOOD and the related wiring in the car is good.
At this point you must check the sender's black ground wire that is held in with a sheet metal screw to the trunk pan support brace roughly above the differential on the driver's side.
If that looks good, looks like it's tank-dropping time.
IMHO, you need a better service tech/mechanic if you are not going to work on your own car. Someone that just orders what they can get (even though it's wrong), is not someone you really want to deal with. (IE buying a sender with the wrong # of fuel connections).
-If you don't stand for something, you'll fall for anything.