how can i fix my 1989 nissan pickup truck?

I'm having problems getting my 89 nissan pickup to start!it is a fuel injected z24 4 cylinder engine you turn the key and it trys to start but wont! i checked to see if the spark plugs were getting fire and they were! the person who had the truck said the water hose blew off and water went all over the motor then died and could not get it started he also said that he had ran the truck out of gas at the same time! would the running it out of gas be a problem since it is a fuel injected truck!What do I do please help???!!!