Nissan Repair: 94 nissan sentra,1.6 liter, fuel pressure gauge, nissan sentra

Question
my engine turns but will not start.just suddenly happened,what could be the problem?

Answer
Roy,

Check to see if the fuel pump is working by using a fuel pressure gauge on the schrader valve under the hood.  It is not he fuel rail and looks like what you put air in your tires.  Parts stores rent them.  If you have fuel pressure then check the ignition relay and related components.  Email me back with what you find.