A buddy of mine got a real sweet deal on a small cabin cruiser that the owner just had the motors rebuilt in. The owner could not get either motor to start. He got frustrated and gave the boat to my buddy for a song. My buddy studied the situation, asked a bunch of questions, and then switched the starters. Both engines fired right up. They were counter-rotating and the owner did not realize it.
If you loosen the line at the injector and you get a squirt, squirt, squirt when turning it over AND it is turning the right direction it should fire, unless something else happened.
1. Are you sure it is turning the right direction? Things mentioned earlier in this post raise the question.
2. Are you getting a steady squirt, squirt from the loose injector line?
3. If it ran before it should run now if it is getting fuel, air, and rotation and if nothing else changed.