Turns over but will not start?

Replaced fuel pump after it quit running and sat for a year, was told pump was bad. My brother-in-law replaced the pump 2 years ago and the car ran good for a year. After we put another pump in we had to jump it off and t cranked up and ran until we removed cables, took battery to be checked and charged which is now good but tried again to crank and only turns over, I sprayed starting fluid around air filter to see if it would start but only turns over, one thing though, when we put battery back in it did start for about 5 seconds and now will only turn over, I wonder if it could be coolant temperature sensor. Any ideas would be appreciated.