The fuel injector bleeding process on a Massey Ferguson 2615 tractor is a slightly different process depending on the model. Generally, you will want to turn the key switch on and start the engine. Once the engine has been started, you will want to open the fuel injector bleed line by loosening the union located at the head of the injector bank. After the union has been loosened, you can begin to crank the engine over until fuel is seen being expelled from the fuel injector bleed line. Once fuel is seen coming from the line, tighten the union and turn the engine off.