Alright after reading your post I sucked it up and cut a hole in bed. I only got half the hole cut today but I can clearly see the 2 hoses deteriorated and almost collapsed going from sending unit to frame lines. I picked up some 3/8 a1-15 line from west marine few weeks ago looks like I will be making a trip there tomorrow for some 5/16. The plan is tomorrow finishing the hole in the bed and hopefully pulling the unit out for inspection. Thank again for giving me motivation to check the sending unit, if the lines on top are in condition they are in then I’m sure there is something going on inside.