72 Demon starts bogging sporadically once warm

So I regrounded the fuel pump wire, installed a new fuel filter, removed all the old fuses and exchanged them for new fuses and cleaned the terminals and then changed the oil for good measure. I took it out for a ride again today and same thing, once I was trying to climb a hill it started to bog on me... I turned around immediately and went home under bogging power. I immediately opened the hood while the engine was running and checked the fuel pressure and it read 0 psi.... Can anyone explain why this may be happening (other then just a broken pump)? The fuel pump is running the whole time, I don’t understand. I can rev the engine just fine sitting in park or neutral, but the second i try to drive under load up a hill it seems to bog and want to die...
Thanks in advance