Limp mode, fuel pressure low

[Mark Bowen]

Hi,
Can anyone offer any insights to what I'm missing?

My car came up with a mixture of pressure too high and too low.

I've changed the fuel pressure regulator and the too high has gone, but now it keeps going into limp mode. So far I've changed,

Fuel pressure regular on the rail
Fuel pressure sensor at the other end of the rail
Fuel filter
Fuel pump in the tank. (Was a 2nd hand one, but it's stopped the lumpy idle, so presuming it's better than my last but surely that won't be faulty too?)

A mechanic friend said 'is yours a 2ltr diesel?' when he said the pump in the tank like it's a common problem with the low pressure error, but fitted it last night, the lumpy idle went and was sure we cracked it, but took it for a run today and came back as soon as I tried to pickup speed!

At the moment I'm getting
p0087 fuel rail/system pressure too low
05175 fuel pressure regulation control difference
05211 fuel rail/system pressure too low
05212 fuel rail/system pressure too low

Not sure what else to try so any pointers is greatly appreciated.

[Crasher]

Did you prime the low pressure fuel system each time after opening it up?

[mickeybo]

model and engine code would certainly help

[Crasher]

Or the VIN.