I have a 2000 Fleetwood Bounder Diesel, Cummins 275 ISB on a Freightliner chassis. When I parked it all was fine, I pulled it out yesterday and the fuel gauge stayed at E. The tank has about 50 gallons in it. I ran the generator for about 20 minutes, it will not run if the tank is 1/4 full or less. I checked the gauge connections and all else works like it should. Any ideas on what to check? I drove it about 20 miles to see if it would start working with no Luck. Thanks in advance for any tips.