This my first post so hello to you all, if anyone can help with my problem please join in with this thread.
Bit of background - poor starting issue on D2 174000 miles. Read lots and lots of threads on here and currently working through the issue. Started at tank working my way towards injector seals.
Removed fuel pump - (working fine but cleaned anyway)
Removed fuel tank - no damage but had black oil film on bottom of tank
idea's welcome guessing injector seals?
Removed fuel pipes - no damage
ISSUE - Removed filter housing - checked valves
Rear left nearest chassis - empty (no non retun valve) ordered one
Front left - has air bleed valve (dirty) ordered new one
Rear right - found non return valve with rubber cap ??(should this be here)

Front right - empty
So little confussed, is this a case of non return valve being placed in wrong place or do i need to order one of these with the rubber end on as well
All ideas welcomed
While i'm here might as well ask - oil layer lining fuel tank is that injector seals- I'm on my way to replacing them as well.
Bit of background - poor starting issue on D2 174000 miles. Read lots and lots of threads on here and currently working through the issue. Started at tank working my way towards injector seals.
Removed fuel pump - (working fine but cleaned anyway)
Removed fuel tank - no damage but had black oil film on bottom of tank
Removed fuel pipes - no damage
ISSUE - Removed filter housing - checked valves
Rear left nearest chassis - empty (no non retun valve) ordered one
Front left - has air bleed valve (dirty) ordered new one
Rear right - found non return valve with rubber cap ??(should this be here)

Front right - empty
So little confussed, is this a case of non return valve being placed in wrong place or do i need to order one of these with the rubber end on as well
All ideas welcomed
While i'm here might as well ask - oil layer lining fuel tank is that injector seals- I'm on my way to replacing them as well.