I have some diesel fuel that is about 3 years old. It has been sitting in a auxilary tank in the shed in the yard for all this time. It has been sitting out there through 3 Phoenix summers with temps up to 118 deg. But it has not been subjected to any water and very little humidity. It also had PRI-D added to it when it was first put in the tank. If I look in the tank with a flashlight, the fuel still looks yellow/clear pretty much the way it looked when it was put in the tank. Is this fuel still useable? Could it screw up my injectors or injector pump?