What was found
PHX-FLT 299-FUEL SMELL IN CABIN-C-WHILE THE AIRCRAFT WAS SITTING AT THE GATE WITH THE APU RUNNING AND AIR CONDITIONING PACKS ON THERE WAS A SMELL OF FUEL IN THE CABIN, STRONGEST OVERWING. WITH THE PACKS TURNED OFF THE SMELL DISSIPATED. MAINTENANCE TROUBLESHOT AND FOUND A FUEL LINE ON THE APU MISROUTED AND HAD A HOLE WORN IN IT CAUSING FUEL TO LEAK. THE FUEL SMELL WAS BEING DRAWN INTO THE CABIN BY THE PACKS. MAINTENANCE REPLACED THE LINE. FUNCTIONAL AND LEAKS CHECKS WERE GOOD AND NO FURTHER SMELL OF FUEL IN THE CABIN WITH PACKS ON.