Cranks over but won't start changed fuel pump but still not starting started once drove it 20 miles and now won't start again

Don't no if i can solve your problem but can you hear the fuel pump work for about 3 sec.s after you turn the ign. key on. If so then you should be getting fuel. If not you may have a blowed fuse or bad fuel relay. Sometimes its worth the cost to replace pump, relay , fuel filter , when the pump goes out. I had a truck that burnt up two fuel pumps before i done this. If your getting fuel, be careful not to miss up a plug wire but pull one off and put a old plug on it, lay it on or ground it to metal of the car, not close to something that will start a fire and have someone turn the motor over and you watch to see if it sparks. If it sparks I don't no anything else besides jumped time. Try this at your on risk but its just a few simple things to try. From one person with auto problems to another

I had a 95 Astro that acted in a similar way. Mine was the fuel pump. I wonder if your ground is loose for the pump circuit or if there is a relay dying on you. Does it act differently with a change from hot to cold weather? A loose ground would do that. You could also have a faulty pump. I heard stories of people getting non-GM approved pumps that failed or had to low a PSI to accurately supply the engine with fuel. Is it getting adequate fuel pressure (50-60 PSI). It should be 60 psi but I was told my 50psi was within GM specs. Mine eventually drank the radiator due to a blown head gasket that no one ever properly diagnosed.