Fuel range showed 79 miles. Pump shut off after only 8 gals. (Should have taken about 20 gals.) I now have gas all the way up the fill tube to the flapper. Fuel gauge shows a little less than a half tank. The fuel range now jumps around between 175-205. IS the fuel range and/or the fuel gauge accurate? AS it is now I can't add any more fuel untill the gas goes into the tank. Any ideas what the issue is here. This is a 2021 1500 Bighorn with 26,000 miles. I have seen with a google search of similar issues. Anyone have the same problem and can offer some assistance on cause and fix for this problem