I have a 200 ford taurus lx flex the starter went out last week got a new on the altornator is new the batt is less than 1 year old and the belt is still in good condition but it still wont start

with the new starter, does the engine turn over when you turn the key to crank or does the engine still not turn over with the new starter ?

It will turn over just not catch to start

remove the gas cap and have someone listen there when you turn the key to the on position. if the pump is good you should be able to hear it there, even if only momentarily. if you can hear the pump, you need to check for fire at the spark plugs.