motor turns over, but will not start.Could it be a relay? on 1992 Plymouth Grand Voyager

I had my alternator replaced a couple of weeks ago and ever since it does not start up without turning over several times. Now I had filled it with gas during my lunch period and went to leave work later,and it will not start.

Asked by for the 1992 Plymouth Grand Voyager
ck fuel pressure an dfor spark when not starting