My multipla not starting. Starts if put start spray in air filter then stops after few revs. Beleive not getting diesel. Put tester lamp on wires going to injectors and no power at any time and when cranking. Dont think power going to them to operate injectors. Is there a fuse.?? Or some other reason. ???possibly my immobiliser is faulty.??? But dont know how to check or disengage immobilizer to try that. Any help greatly appreciated. Thanks. Gary