Hello 1991 Sentra,I drove it to work today 25 miles,shut the car off,and it will not start.Cranks good and I have spark,I can hear the fuel pump running.It will not start even when I gave it a shot of either.Don't know if it jumped time or not.It has been very cold here (Michigan) the past few days.Engine is the GA16DE.Any ideas would be apprecated.Thanks Diesel 1962

just because the fuelpump runs does not mean it is pumping with pressure.find the pressure relief valve on the fuel rail.turn the key on and see if any gas comes out of the valve. if no pressure then could be the fuel regulator or the fuel filter or the fuel pump.