Will not start?

Okay, so I went to the store one night it ran just fine no lights came on, on the dashboard went to leave the next morning it wouldn’t crank it would turn over but wouldn’t start I went and got a new battery put it on it crank and stayed on for 30 minutes then I drove it down the road turned it off it sat there for about an hour to hour and half cranked right back up drove home went to leave the next morning for work and it wouldn’t crank again. So, I checked the spark plugs one was bad, so I changed them all with new plugs it cranked for about 5 seconds then shut off. So, I was thinking it maybe something with the fuel pump.