Loosing fuel pressure

I have had this issue with both of my cars. My 71 Challenger it was the fuel filter causing it. What type of filter are you using? Mine was an Earls in line filter with changeable element. There are screens on both ends of those and they can get waded up under hard acceleration and stop the flow of fuel, needless to say it went in the trash and I put an Edelbrock filter on it. Been fine since.
My Duster on the other hand....
3 fuel pumps
2 filters
3 sending units
1 new metal line from the tank
Not sure what actually fixed it but, it seems fine now. It really seemed to go away after the last sending unit and new metal line from the tank.

Good luck!! Let us know what ya find.