Looking for help with a 3406b fuel injector pump (7W3906). The engine has been sitting for several years and had a stuck fuel rack. Once freed up the engine fired up. The problem is it won't restart unless I manually move the rack back thru the access port at the front of the pump. Shut down solenoid retracts with key on but rack does not move in to run position. Did something come apart in there?? Not familiar with the internal workings of the pump and governor. Any ideas?