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The tank must be dropped in order to change out the sending unit, if the top of the tank is up against the bottom of the floor or if you do not have access and lots of clearance for the height of the sending unit. You may want to consider taking it to a shop that has the equipment to lift the coach and do the repairs for you.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7