My Case 1150 dozer began to smother down, then regain rpms. It would level out and then smother down again. Needless to say, it had no power when trying to push. I changed fuel filters. It cranked. Ran a minute and died. Will crank on ether but dies when it burns it up. I tried bleeding the injector lines, but I am getting no diesel from any of them. I AM getting diesel from the filters to the pump. HAS MY INJECTOR PUMP GONE BAD? The engine is either a 401 or 451. I cant find any number plate. (where should it be located?)It is not turbo charged. The dozer(and engine)was built in 1968. The engine is the style that came in 1270 and 1370 Case tractors.