[V8] fuel pressure, poor running

[dsaad at icehouse.net]

I wonder if the fuel return line is plugged somehow?
If any sensor was failing, I could see the motor running badly, and being
temperature dependant, but no sensor can change fuel pressure. This is strictly
a mechanical thing.

******* light bulb just turned on in brain - could a fuel injector be getting
stuck on when it is warm? If so, you would see the evidence at the tailpipe and
by inspecting plugs.
I would also expect a code of some sort if this were the case.
(the light bulb just went out....)

Dave


Quoting Jeremy Ward <jward.v8 at gmail.com>:

> A friend of ours in Moscow is having some strange problems with his V8.  If
> he has a full tank of gas and the motor is cool, he is able to drive the car
> with a decent amount of power, up to 6500rpm.  Once warmed up, the max rpm
> is 5000.  Also, the less gas he has in the tank, the poorer his power output
> is.  If I understand his email correctly, power in 1st gear in fine up to
> 2500 - 3000 rpm, but starts to stutter at around 3500rpm.
>
>
>
> Fuel pressure drops as the engine warms up.  Fuel pump is new.  Fuel filter
> is new.  The gas tank has been 'washed out' twice (not sure what process was
> done here).  No change in performance when driven with the fuel cap removed.
> And the kicker - No codes are being thrown.
>
>
>
> Those of you that have replaced gas tanks due to 'holier-than-thou'
> attitudes, what were the symptoms (other than fuel leakage)?  Having seen
> the pictures of the restoration of his V8, I know he had a little bit of
> rust.  I know fuel pressure regulator doesn't throw a code, but I can't
> imagine it being effected as described.
>
>
>
> Here are the photos (and English translations thanks to Babelfish) of his
> restoration:
>
> http://babelfish.altavista.com/babelfish/trurl_pagecontent?lp=ru_en
> <http://babelfish.altavista.com/babelfish/trurl_pagecontent?lp=ru_en&trurl=h
> ttp%3a%2f%2faudiv8.ru%2fforum%2fviewtopic.php%3ft%3d470%26sid%3dce47de72a6a9
> 34a25796550a1b22820c>
> &trurl=http%3a%2f%2faudiv8.ru%2fforum%2fviewtopic.php%3ft%3d470%26sid%3dce47
> de72a6a934a25796550a1b22820c
>
>
>
> Thanks in advance for your help with Dmitry's problem,
>
>
>
> - Jeremy
>
> _______________________________________________
> Audifans V8 mailing list
> Send posts to: mailto:V8 at audifans.com
> Manage your list connection: http://www.audifans.com/mailman/listinfo/v8
> Have an Audi V8 question?  Check the Audifans Knowledgebase!
> http://www.audifans.com/twiki/bin/view/Audi/V8
> Have a V8 answer? ... Please help others by adding to the KB ... all
> contributions welcome!
>