Stalls How to fix this ?

sounds like 50 psi ain't enough , who did the repairs and why ?

I Do my own repairs. the fuel pump failed prior and replaced with a Oem one several months ago It stalled 2 days ago and threw a O2 code I replaced it new made no change Same as above My next step is to look at the temp sensor Them back to the TPC if needed Last resort to the cats I think 50 is ok , I also trained the fuel tank as thought it was water at first

I don't know , sounds like a gremlin , check for motor to chassis ground . Look for corrosion at relay box ? There may be 2 relays for the fuel pump , one for prime/start up and one for operation . Mice can invade even a daily driver .

I know mice are bugger , but not it Up date ,it started after sitting all night 50 psi while running I clamped the return line no change in fuel pressure took off the intake changed fuel regulator, took off fuel filter , its fine , cleaned ground at tank Changed the relay with another one I had , No changes , 45 psi while cranking..looks like the Oem pump failed lasted about 2 months going to change it again.