Yesterday we were finishing up a 3 month trip . Only a thousand miles . Just before I stopped to fill up my tank , I noticed the fuel gauge bouncing around . Then not much longer and it was reading a hard full, pegged out, and that’s before I added 47 gallons of fuel because I always top my tank off after a trip . Does anyone know where I should start my troubleshooting ? Is there a fuse maybe? I really don’t want to have to drain the tank to work on the sending unit . Thanks for all your help . 2000 Beaver Patriot Ticonderoga, 3126 330 caterpillar .