My car stalled out on the road.   There was a little fuel in the filter bowl, but when removed the top of the carb it was empty.  I removed the fuel cap, no change.  I removed the fuel line into the carb kept cranking for a minute or two and the fuel started flowing.   The car started and I made it home, but I noticed a lot of bubbles in the filter bowl.   There are no leaks ANYWHERE.   I would assume if air is making it into the filter there would be a fuel leak wherever the air can enter(???)

Last year I replaced the tank, all hard fuel lines, the hose that feeds the pump and I had the pump rebuilt (pump was a "made in Canada" version that came with the car).  

This week, I bought another rebuilt AC fuel pump (from AG Rebuilders) and a new 55 vented fuel cap.   Went for a ride the same thing happened after 40 minutes the car feels like it's running out of fuel (tank was filled today and it's still at least 3/4 full).
I am going to empty the tank, to ensure everything is clean and look at the tank pickup with a bore scope.
Any other ideas?