My car cranks, but will not start

I'm having some serious issues getting my car to start. A few days ago, I went out and tried to start it; the engine cranks, but fails to start up. The few days, I did some troubleshooting and such, and ended up replacing the fuel filter, as I thought I was getting not pressure at the motor (but the fuel pump is confirmed to be working).

So I try to start after replacing the filter, and still nothing.

I've checked the pump, the spark plugs, fuel line pressure, fuel pump relay and fuse, and (already mentioned) the filter. Can I get some advice on what to check next?