losing fuel pressure on 2002 Jaguar X-Type

I had the fuel pump replaced and the car is still not holding fuel pressure, this car does not have a fuel pressure regulator so what els could it be? Iv'e changed all the sensors knock, o2, crank shaft, all codes has been cleared. check engin light still on.

Asked by for the 2002 Jaguar X-Type
This vehicle uses a fuel pump driver module to control fuel preasure. This device can only be checked with some diagnostic work and some eletronic tools. If these are not available feel free to call Scott at Austin Mobile Mechanics 512-477-9414.
The fee's to repair would depend on the problem your vehicle has. This is a repair we would only offer at our shop location.