Tandam pump enquiry!

[vw754]

Golf 115 tdi pd .2001 Y-REG Gt tdi
Any way i can check the tandam pump timing,manually or with vag/com?
sluggish car,tried changed,and done nearly everything with this sluggish car! this is the only thing someone has said to check,please help,car drives as if its a 80 bhp !!!

PD PD PD

 

[Macduff]

Is there timing on that pump?

I thought the PDs effectively ran a pressurised fuel rail that the PD injectors took their feed from. The timing is all handled by the PD injector cams and solenoid activation.