Often, the wirng corosion is onthe part of the pump that you can't see... inside the tank. Mine tried to give up the ghost last year on the B-body roundup in rural NH. I got mine to get me home to Maine, but when I changed it, the wiring inside the tank had no insulation on it!!!
Changing the pump isn't that bad in dry, warm weather and your tank is mostly empty.
I'd say change it before it bites you in the butt.