Update. Noticed another thread about DTC 01268 so I'll share the little bit I know (and compile some facts and quotes in case I need it for legal reasons).
Finally, 2 B4V's back in Montana and running well. New IP in place (but driver's window acting up again, me grumbling and swearing). Farley's Imports in Casper Wyoming diagnosed and repaired my vehicle for $150 less than the dealership wanted for bad diagnostic ("guessnostic") and tearing my car apart. Farley's explains my bill, asks if that sounds ok to me, explaining almost apologetically that he had to add $25 when he replaced my seeping valve cover gasket and that there was a lot of putting back together to do.
DTC 01268: first let me say that I don't know much about our cars, but try to learn as each situation crops up. I never had the opportunity to try the hammer mod as suggested by Audi5000TD to bring the quantity back below upper limit. I would definitely try this before replacing a pump that's coding "upper limit reached" or "lower limit reached". Another forum member mentioned that if (bio)diesel has a significant amount of water, it will react to form carbonic acid, which can or will etch or wear the metal of the pump skirt and other sensitive parts. So my guess is that the quantity adjuster gradually increased the amount injected to compensate for the less capable pump as the skirt wore. When I hit the A/C button, this increased demand for power resulted in ECU asking the quantity adjuster to send more fuel, surpassing the upper limit threshold, and the ECU tells the shutoff valve to close. It seems that one could compensate for a worn pump skirt with the hammer mod (no $), or even a custimized chip ($), but really I have no idea.
This scenario leaves me with a few questions;
1) Why is the ECU blamed faulty? It's in perfect order. Answer: Dealer kneejerk response. Emphasis on 'jerk'.
2) Why was the vehicle unrestartable without a new pump, but with codes cleared, and the A/C off? Possible answer: Perhaps upon startup there are additional loads which will keep the requested quantity too high, fuel shutoff valve closes almost immediately, or never opens.
3) Does the Upsolute chipping come into play here, as one if it's functions is increasing injection quantity? (not blaming Upsolute for anything, just wondering if I may have been able to swap in the original eProm and get a restart.)
The dealer: Nobody local uses them, from what I heard. Yes, it's been confirmed that they just prey on people passing through. There is a 1984 Bronco for sale on the lot that has been there for over a decade. In the back, a graveyard of mostly VW's that I assume were left when their repair bill skyrocketed (when I asked about all the cars, the question was evaded). Over at Farley's, constantly swamped with business, and really cool immaculate vintage VW's, Camaros, British cars, etc. being worked on with care. Nice shop, better than the dealer's. At the dealer, when I'm initially asking about the ECU, he gives big sigh and says "there are several items in your vehicle that can be considered an ECU" (what?)Then tells me that I need a new ECU. Then told me that biodiesel will "drop out your engine", and when I questioned him on whether the DTC was "upper limit reached" or "lower limit reached", he said "I don't know what your little book is telling you", I say "It's the Bentley", then silence from him... Also, anytime at all that I asked a question he became perturbed, saying "It's your money, you can do what you want." And three times asking me if he should get me a can of gasoline and some matches. But the big thing was when, as I see it, he tried to get me to throw the first punch as he physically prevented me from accessing my vehicle with his body, smiling a cash eating grin (it was close, breathe deep, call the cops, serenity now). I always maintained that I would pay for the IP diagnostic (what's that? 1/2 hour max. to plug in the OBD?)
In the end, I'm pretty relieved, with my only regret being that I wasn't able to work on my car myself. The original IP did have over 140K on it, I haven't received any legal papers in the mail yet, I know a very good mechanic in Casper, the Passat seems to be pulling better than ever especially at higher RPM's, and the canoe shuttle system is back in action.