Ecu tested ok new fuel pump new fuel pressure regulator

 

I will need a lot more info than that to help. The mileage, any engine or fuel mods or tuning, the age and type of engine P?? etc, exactly what are the symptoms you are experiencing. It can be various issues, fuel filter, blocked fuel bleed valve, leaky injectors, CPS, faulty glow plugs or power to them, battery condition, correct sequence fuel bleeding after the fuel pump was fitted etc, etc. Don't throw away cash at the assumed problems until you analyse what exactly is wrong. Also have you checked the DTC codes then printed and cleared them all, often the answer is hidden in those codes.

PS: There are very few TD5's used/allowed in the US so it's not the ideal forum for the TD5 turbo diesel data.