Thoughts on my gas gauge situation?

[davepl]

I had a tech install an in-tank pump and level sender from Tanks, Inc.

The first time we flipped the tank upside down (to try to cause the sender to read full) it only read 33 ohms, so I left him to sort it out.

When I picked the tank up he said he tested it and it ran exactly 0.5 to 90.5 ohms.

I installed the tank, added about 4 gallons, and it read just over empty, so far so good.

I drove it to the gas station and added 5 more, but the needle didn't move.

Now it's got fuel in it and I really don't want to mess with it. I just can't picture what might be going on that it worked on the bench and not in the car.