[V8] fuel pressure, poor running

[Jeremy Ward]

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