I had not driven my car in 4 years while I did body work and paint. I would regularly crank it and let it run though. Two weeks ago I finally get to take it for a drive and in five minutes it quit like it was out of gas. I towed it home and it cranked right up and ran perfect. I went and bought a new fuel pump and a clear fuel filter to see the flow. I did notice that the longer it runs it looks like the less fuel is in the filter. But even letting it run for 30 minutes it never quit. I took it for a drive today and in about 10 minutes it quit like it was out of gas. If I let it sit for a while it will crank and run about a minute or so and die again. I did this all the way home. I let it sit for 10 minutes in the drive way and now it runs great again. Any ideas as to what is going on?