My 89 S10 Blazer won't start!!!
 

I have a 1989 S10 Blazer, it has been a very loyal truck to me and to my girlfriend. Recently as of earlier this afternoon is wont start. I drove it around just fine yesterday and it started right up but sometimes when I would try to give it gas it wouldn't go. I parked it around 12:30am and when I woke up around 1:30pm I went to start it to leave and it just cranks over and will not start. I don't know what this problem is, I feel like it could be the fuel pump but not forsure. I know it was throwing a code for the mass air sensor but I don't know if that would keep it from running. I drive it everyday about 30 minutes to work and 30 minutes home from work and never had any problems with it. This is my only vehicle and I need to get it back up and running so I can go to work. I need help asap!