67 Camaro with no fuel pressure (video)

[cp87]

I have been having fuel delivery problems for awhile now and can't figure it out. This is my 2nd Mechanical pump and after about 15min of run time my pressure drops to zero. I have changed the filter, cleaned the line, checked to see if the tank is clogged and did not find anything. This is very frustrating, any input or suggestions would be appreciated

I want to switch to an electric set up and was looking at the Areomotive SS pump.

https://www.youtube.com/watch?v=Jktatkm8vdA

After 15 min

https://www.youtube.com/watch?v=WuI7oew6VyI