Just a guess. Getting everything back in place without a leak on the fuel injection system can be tuff (a lot of "O"rings). I always pressure test it with fuel before re-installing. Don`t overlook the simple things like a spark plug wire coming off.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD