I also have the same problem, after running for 10 to 15 minutes the fuel disappears in the filter(I have a see thru filter)I go into vapor lock when I idle, the engine get's warm, My fuel pump eccentric is newly installed, replaced Tank, sending unit and new fuel lines. I am working on it at this moment.
you have a see thru plastic filter, or glass......I would get rid of it ,as if it cracks...booom. anyway I had a see thru filter long ago too...after car warmed up, you never saw gas in it, car ran fine...so the filter is not a 'give away' to find problem.