Opel Insignia 2.0 cdti 160hp fuel pump pressure problem

Hi for all need your help

I have here in my garage an Opel insignia with a high fuel pressure problem !

P0088 - Fuel pressure high on fuel pipe 

Desired pressure : 300 bar
Actual pressure : 1600 bar


Injector leak testes good , new pump and new pressure sensor and not solve .

Anyone ever had a problem like this ? 

Thx

The pressure increases from 0 to 1600?
At idle is 1600? the engine it stops?

can be a clogged fuel return line

the pressure drops when accelerate ?
put here the bosch number for hp pump

The pressure increases from 0 to 1600?
At idle is 1600? the engine it stops?

can be a clogged fuel return line

the pressure drops when accelerate ?
put here the bosch number for hp pump

This car sometimes start normally and show at idle 1600 bar . When i acelerate show normal desire values. When drop to idle go to 1600 +- and sometimes shut down and knocking like a problem in fuel regulator 

My pump is 0445010248 and its new

Injetors repaired . Same problem . Anyone ??

Did you  tried to remove the fuel return hose from engine and put a new hose in fuel pump  in a bottle to see if there is a change in pressure?
Try this to see if all the return system is not clogged somewhere.