Please, do anyone know if there is possible to mount a filter between the high pressure pump and the common rail?

My car L322 2003 Td6 did not start, so I changed a couple of injectors. Then it started the next week or so. But now I have the same problem.

So I wonder if the problem is coming from the high pressure pump wear. It seem to give a good pressure -320bar / 800rpm A diesel expert told me I should look after metallic particles in the fuel tank, and that a high p.p can wear down gradually and then new injectors dosent help much.

I will soon check the fuel tank, but now i want a filter anyway for the future.

I mean I have seen such filter somtime. I can not see that the 13-1400 bar pressure could be a problem nwith the proper housing for it. But maby the extra volume or resistance can make problems?