Tractor Repair: fuel injectors, injector pump, fuel injectors

Question
i lost fuel to the injector pump, and cant get it to pump. ive tried bleeding the lines and still no fuel. a friend told me to prime it with wd40 and it wont fire. any suggestions?

Answer
I need more information. If need to know what kind of tractor or engine we are dealing with.  If you do not have fuel to the injection pump then check it at the fuel filter or the primer pump. if you have fuel in those locations and at the pump then you rack inside is stuck or you lost power or ground to the fuel shut off solenoid. Follow up with more specifics.