Mike didn't you say something like if it dont take 5 gallons after a rebuild and dose not have pressure to the test most its most likely the pump to cover gasket or am i way off here PS i don't drink but that don't mean i couldn't have did something dumb
I was not picking on you, just posting observations.
If you have no pressure; you either have the gaskets reversed, stator housing left loose ( back half of the pump), something installed incorrect in the stator housing ( converter flow valve or lube regulator valve or pressure regulator valve), or sump filter cracked.
If it had pressure when you started this build; then the problem is something you did.