Folks, I have a 2011 Itasca Ellipse qd42. My onboard propane tank is 27 gal and supply's only my 3-burner stove top. Every time I get down to 3/4 of a tank my gas shuts off. I thought is could be a faulty gauge so I went and filled the tank and it only took aprox 4 gals of propane and every...