dieselfuel
Veteran Member
My understanding is, a pressure reversion is causing the HPFPs to grenade. What causes it...? That, I don't know.
My understanding is, a pressure reversion is causing the HPFPs to grenade. What causes it...? That, I don't know.
What we don't know is if:The pumps blow because Bosch made a POS pump.
The percentage of failures is only low if it's someone else's car and not yours.
Yes, it was reported........There have been several reported Passat Failures.......one last week on the dealer fill....
I am only aware of three, two dealer misfuels and one owner misfuel.There have been several reported Passat Failures.......one last week on the dealer fill....
I think the vast majority of people don't use any additives.. That might also have something to do with it..Why does everyone keep saying additives don't work? Obviously it is impossible to prove they DO work, but if you actually read the HPFP failures thread it shows some interesting things...
For one, the vast majority of failures are without any additives. There are only about 8 failures in the thread that used additives and still failed. Of those; 4 stated they were only used "sometimes" or "monthly" or in one case "just started using..." so I wouldn't even count them as actually using additives (if they are not used in every tank they won't provide any meaningful protection anyway).
So that means 4 actual failures while using some form of additive. And 1 of those stated no metal shavings at all in the fuel system, just low pressure from the pump, so the additives may very well have saved him from a full implosion.
Sounds to me like additives do at least help.
Ding ding. The fact that there have been HPFP failures with people using additives should show you that additives do not work and/or its not a lubricity related issue.I think the vast majority of people don't use any additives.. That might also have something to do with it..
We do know one thing. The Bosch design allows the cam follower axis to rotate 90 degrees. When/if that happens, catastrophic failure seems to be inevitable. Delphi has a design that they claim prevents this and VW is using it in at least one engine. Why they are not using it in our engines and why Bosch has not adopted this design is a big mystery to me.Let's state that another way:
Additives may not prevent HPFP failues. Poor lubricity fuel available in the US may not be the sole cause of HPFP failures.
We don't know the driving issues of the failures. From the fact that we have seen no clear evidence that VW/Bosch have found a clear and reliable fix for these issues, they don't understand all of the factors leading to the failures either.
There is no way one can claim that it is not a lubricity issue. The question would be whether or not the pump was built to withstand U.S. fuel specs.Ding ding. The fact that there have been HPFP failures with people using additives should show you that additives do not work and/or its not a lubricity related issue.
It could be that the Delphi design can't handle as high fuel pressures, or that it can't handle as high fuel volume, or that it has other issues preventing use of US fuel.We do know one thing. The Bosch design allows the cam follower axis to rotate 90 degrees. When/if that happens, catastrophic failure seems to be inevitable. Delphi has a design that they claim prevents this and VW is using it in at least one engine. Why they are not using it in our engines and why Bosch has not adopted this design is a big mystery to me.
I think there has been 4 in Canada, one in Quebec, and I think 1 in BC, and not sure about the other two;I've searched the forum and couldn't find an answer...
Is there an official list of HPFP failures that have occured outside the US?
Apparently the diesel fuel is closer to Euro spec in Canada and from reading the list of failures it does look like most of them are occuring in the US. I saw one failure it Quebec but it wasn't the actual pump, just pressure regulator and it didn't grenade and take out the entire fuel system.
I'm sure it's been said somewhere on here before but I can't find it and I'm curious if this problem really is isolated to the US?
(I apologize, I swear I've searched the forum but with threads 160 pages long it's hard to read all the posts!)
I've looked through that list, saw the one in BC and QC. The one in QC wasn't actually the fuel pump by the sound of it, but it was replaced with a bad pressure regulator. Looks like the percentage of failures is much lower in Canada and of those few who knows if there was some other aggravating factor.I think there has been 4 in Canada, one in Quebec, and I think 1 in BC, and not sure about the other two;
http://forums.tdiclub.com/showthread.php?t=299854
You have to remember that you're on a VW diesel forum with many dedicated owners. Many of the almost 4000 posts just in this thread are speculation as to the root cause of the failure and possible fixes. The "reported" failures is still fairly small but not insignificant if it happens to your car. Lately, VWOA has been stepping up to the plate and fixing these cars. I think there were a few at the beginning that didn't get fixed and am not sure how VW Canada has been handling those 4 failures. I try not to worry about it, but you'll see my name in here quite a bit too. I have two of these, so if they both go and were not covered by VWOA, I would be out about $1500 - $2000.Something else we should all recognize is that all these other cars seem to have chronic issues if you research them on the web, for example the Altima and it's CVT.
There is a tear down (iFixit) of the B7 Passat fuel pump by 2Micron that appears to use better metallurgy than previous designs.Were those all confirmed misfuels? I don't remember reading it as such.
Either way, you never know. The Passat's HPFP could just be better, but that doesn't mean they are completely fixed. Just because we haven't seen a lot of failing yet. It could become more prevalent. There's just no telling really. I don't think that's the case, but what if the new pump is say 60% better. There would still be failures, they would just take longer to arise.