Could also be that your sensor is incorrectly reading the level. OEM tank sensors are notorious for wrong readings. Suggest you consider installing a set of Horst Miracle Probes to replace the original ones. They really do work.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.