2004 elantra gt

Hello all. I have very basic understanding about mechanics; however, I have managed to replace the fuel filter & pump and have replaced the spark plugs. I have also checked the fuses and they all work fine (did some swapping to make sure). Car still cranks but won't start. I have been reading...

Well I am thinking of selling my 04 Elantra GT. I love the car but with my wife in school and having two cars, one has to go. The Yaris is just not selling, it was close and then the girls financing fell through. Looking at similar cars in the area I would be able to make some money back off...