'94 Itasca Sunrise (454) Fuel Pump/Sender Mystery

[Seann12]

Hi Folks,
Just had ours towed home last night after quitting (suspected fuel pump)...listened at tank while key was cycled, pump was coming on, and of course it fired right up this morning. We'd been having trouble with the sender reading wrong, chasing the wiring today to see anything bad that could also have affected the pump. Before I drop the tank, how can I test the guage from the unplugged sender end? It's reading "over" full when it's not. 3 wires to sender, black, pink, brown/wh.
Thanks,
Seann

[enblethen]

The pump runs through the oil pressure sending unit
Orange wire from oil pressure sending unit provides power to the fuel pump in "run".
Black is ground.
Having two issues I would check and chase the ground wire.
Look at the oil sending unit, located on front LEFT side of engine block. If it is leaking, replace.
edit: It is on Left side