A photo of the pump showing where the diesel is leaking from and a bit more description would be helpful, there is not a breather on the Bosch VE injection pump body as far as I know, diesel is circulated through the pump internals to lubricate all the moving parts, there are a number of seals that can leak though.
Top side of that is the boost pressure side of the "on boost" fuel adjustment diaphragm surely that cannot be vented otherwise it won't do what it's supposed to do.There is.
Top rear of boost diaphragm flying saucer thing.
Yes, that's the vent I know of.
hence me asking on here as I'm at a loss the company that supplied the pump have said they will replace the part but I don't want to send it back without getting to the bottom of the problem of why that seal failed on both a recon pump and my original the turbo was on my original engine and "as far as I know" working without any issue but she was quite covered in oil and detritus by the time the swap happened
Plus 1 on all that, I have mates with 300tdis running vvt's doing 20psi boost and no IP issues, boost pressure only applies to the top of that diaphragm, so cannot see how that could be causing the leak.
they seem to think the same but surely if there is an over boost problem then would it be possible to "blow" that seal out and allow fuel in???
If the diaphragm is not blown out then there can be no pressure effect into that chamber, and the pressure generated by the turbo is insignificant in reality compared to the capability of the seals on the fuel side.
Good point, assumed it was a replacement pump, in which case something has been missed by the "reconditioner", the "overboost" reason they gave sounds to me like a divert tactic.
