I'm having alot of trouble here lately. I changed to a carb and am finishing the car. When my car warms up after awhile my fuel pressure slowly starts to drop then goes to 0 psi then stalls if you blip the throttle as the pressure starts to fall off it will come back up. could this be the oil pressure switch? Why would it do this and not just shut off I'm running a holley 650 carb mallory 3 port pressure regulator, and a new oem fuel pump.

 

regulator?what was set up before carb swap?

 

It had a tbi.