I ran out of gas the other day with a half tank showing on my fuel gage. When I refill the needle goes way past full. Is this a float problem or gage or sending unit?

I am going through the same problem. I have traced it down to the sending unit. The contact inside the sending unit wears and is not working properly. Now the big problem, sending units for '75-'77 are not readily available and the flange is different. If you find a new one it is around $300. I have tested a couple of used ones trying to find one that works, but I am not sure that is the route I am going to take. I was advised that you can buy a new '68-'74 for $99 or less, take the contact and float off, and install it on your sending unit assembly. I may try that to save money and be more reliable. Not sure what route I am going to take, and do not have time tinker this weekend. Hope this helps...
SS

Thanks,
I'll take a look into the sending unit prices around here. Not ready to spend $300 on new one.

My '82 has the same problem. Ran out of gas ONCE. But I have a habit of resetting the trip meter when I fill up and now I know when to get gas.

Plus when I corner hard it hesitates (gas sloshing away from the pickup?) when the level is low.

My gauge isn't always funky. . . but definitely temperature dependent.

To check the fuel sending unit, disconnect the two wires on top of the sending unit. They are hidden under the rubber guard around the filler neck on the right side. One is the postive lead that connects to the sending unit, the other is the ground wire that connects to the flange. Connect these two wires together. This closes the circuit and your fuel gauge should go back to empty. If the gauge does not move to empty and remains past full, then you possibly have a wiring or a gauge problem instead of the sending unit.
I replaced my fuel sending unit this past Saturday. It was not as hard as I thought it might be. On the '75-'77 the fuel tank has to come out. It took about 2 hours, but I did get interrupted a few times.

Thanks for the tip. I'll give it a try. Where did you find the sending unit and how much was it in case I need to replace it?