[JimG]

I have experienced the same thing. I thoroughly rebuilt the gauge last year following instructions from deuce lover and it seemed to be functioning OK with the tank fairly low. When I filled it up at the gas station, the minute I pulled away from the pump the pressure in the tank blew the red fluid out of the gauge. I saw the air bubble push the fluid out. I have screwed around with it some more this year, with the same results. When the tank is less an 1/3 full it works OK. If I fill it more than this it blows the gauge. I have not had time to investigate further. I have never tried to look at the unit inside the tank. I suspect that is where the issue is. I had it working better a few years ago before I rebuilt everything completely. At that time, it functioned but only went up to about half when the tank was full.