[Vwdiesel] ULSD effect on injector pump... :o{

[James Hansen]

I dunno.
I have my doubts that this is completely on the level.
Aromatic hydrocarbons are those built around a 5 carbon ring (benzene, 
which defines it as an aromatic hydrocarbon).  Altering the "aromatic 
chain" effectively alters what it is, as in how many carbons per 
molecule.  Whole purpose of refining is to vacuum distill to separate 
the various lengths of carbon chains, then recombine to make your blend 
as fuel.  the posted explanation you are seeing just doesn't make sense. 
  I could see a reason as being some goofy additive they are using, 
but... I dunno.  Buna-n seals are common, but they fail when exposed to 
methanol and bio-d eventually, and some other stuff, because it is 
absorbed by the material and it eventually fails.  Viton is a different 
composition that resists most stuff.  this just seems to maybe be a more 
of a cover your ass statement rather than an explanation of anything.
-James

Sandy Cameron wrote:
> At 06:53 AM 31/10/2006 -0800, you wrote:
>>    My injector pump is now leaking / weeping, and I'm weeping too. (315K
> km on '91 Jetta TD with MF engine, using Stanadyne / 2stroke oil in 50/50
> ratio forever).
>>    I have talked to a couple of diesel pump rebuilders and the dealership,
> and they are all blaming the ULSD diesel. They all have the same one-page
> notice displayed. Says that conditioners such as Stanadyne can replace the
> lubricity lost in the refiining, but that the aromatic chains (whatever the
> heck those are!) are altered, no conditioner can fix this, and pumps may
> leak as a result. 
> 
> 
> One quart 2-stroke to a tank full should do it
> 
> Last July, I was on a 1000 mile road trip and ran in to ULSD in NW Ontario.
> On the way home, around Sudbury, i srang leaks at ne of the line couplings
> where it fastens to the check valve on the pump, and around the timing plug
> 
> Slacked each off, and retightened (using backup wrenches) and no more problems.
> No gasket / Oring problems yet. A 94-A3, 1.9.
> 
> Sandy
> 
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