[Vwdiesel] More Quantum pump questions?

[mark shepherd]

Hold on there Bill,
One Quantum, soon to be 3 pumps?
If you need a pump, those prices seem good, however, how do you know there 
is anything wrong with your other pumps?

Before you buy yet another pump, why not check the operating parameters of 
your current pump...

There is another thing you can do first though:
If you think you can correctly install a good pump, why not do a quick swap 
in of a known good pump from either your Dasher, or the Jetta, that I think 
you own. It does not matter if the pump is turbo adapted, or n/a.

If you do not feel confident in doing this, then buying yet another pump 
will just help others, and not improve you own position.

Back to your current pump in the Quantum....

Things to test for:
1) At idle run the return fuel into a beaker  for a minute or 2 and expect 
to see about a pint a minute.

2) Do the cold start pull test, where with engine off it should be stiff to 
pull, and with engine running, it should be easier, with minimal effort by 
about 2000rpm. If it remains stiff  then pump is not doing the auto advance 
equivalent of  a gasser's distributor weights.

3)Ideally you should attach  a pressure gauge to the pump to read it's 
internal pressure, which on amn old pump may be as little as 15psi, but 
should be readjusted to 45psi ballpark. I have found that this can be done 
by using a spare 'out' bolt, and adding the gauge to a narrowed single 
outlet banjo, behind which the bolt is perforated to give internal pump 
pressure. To gain extra length, the 'out' bolt needs head thinned.
Pressure can be adjusted by tapping center pin of regulator bolt just behind 
pulley. I  must post some pics...

Using this above technique, I  believe I have this month cured my mid range 
poor mileage, which was only matching my 'about town' and 'fast interstate' 
good mileage of about 40mpg [US]. This has been confounding me for the last 
3 years, on an engine that has outlived it's first Quantum, but never 
matched my stored up one.


----- Original Message ----- 
From: "William J Toensing" <toensing at wildblue.net>
To: <vwdiesel at vwfans.com>
Sent: Saturday, May 01, 2010 10:18 AM
Subject: [Vwdiesel] More Quantum Questions?


>
> Does anyone know anything about DieselVW.com aka Rothenebacher 
> Engineering, Mathews, N Carolina? They are offering a rebuilt injection 
> pump for my 1982 Quantum TD for $250 plus a core charge of $150 or $400. 
> On their webpage, they say the IP has been bench tested & then tested on a 
> VW diesel to see if it operates OK. If your reports are good, this sounds 
> like an excellent price. Please let me know any pro or cons on 
> DieselVW.com .
> Bill Toensing, Nevada City, CA
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