ACC is for accessory. Whomever wired it picked that one since the circuit is only live when the ignition is on or in the accessory location.
Not a great choice. Your fuel pump is probably drawing close to, if not more than, the fuse rating. You should rewire the fuel pump. I would go with it's own circuit and fuse. Use a relay to control the circuit or, even better, get a oil pressure switch. It will turn off the fuel pump if the oil pressure hits zero (like when the car isn't running). It's an added layer of safety.
Don't just stick a larger fuse in there. The wire feeding that circuit is designed for 10amps. If you put a larger fuse it you will melt the wire (and possibly start a fire)
82 Cherokee WT - SOA/SF/agr box/Borgeson ujoint steering shaft/401/performer/holley TA/HEI/BeCool/727/np208/d44(aussie)/amc20(ARB)/BFG 35X12.5/Corbeau Moab Seats/RCI 6point Harness,Hella Aux lights/tuffy console/killer32 slider bars/custom bumpers and roll bar/Alpine head unit/amps/speakers 2002 Liberty Limited Early edition - Basically stock