So long story short, i bought a non-running 96 A4 2.8 from a friend as a project. Recently did the timing belt, cam sensor, fuel pump, slave cylinder, spark plugs, MAF, and replaced the snapped breather tubes. It runs, but only for about 1-2 minutes max. I can hear the pump prime, but sometimes when i turn the key, I hear nothing. I'm thinking that its priming fine, but doesn't pump fuel while running. What could be causing this issue? This is my first project and I know that I'm not a mechanical genius, so I'm turning to the forums for help.

 

Check the codes.