Fuel sending unit Kaput!
Finally, my fuel sending unit gave up, through out the years since I owned this coach, it was highly inaccurate and always bouncing around, I pulled it out of the tank, put a ohm meter on it, and it is dead, I do get a reading near empty. It is a Transfer Flow inc product Chico, Ca. I called them to get another but they don't carry a stock of them. He said he could repair it but will be going on vacation for nearly three weeks.
So, I ordered up a different brand it is a 33-240 ohm unit so I had to order a fuel gauge also, I got one with a full sweep and programmable. The old unit was 90 ohm so my old gauge couldn't handle the new fuel sending unit. Maybe I'll get some fairly accurate readings with the new unit.