I doubt this would cause that much of a problem.  My fuel regulator was
totally blocked, fuel pressure was around 90 psi.  My gas mileage dropped to
about 17 mpg.  Sounds like at least one of the major signals (O2, Temp2,
AFM, etc.), is not getting back to the ECU properly.  Did you check the
signals at the ECU plug, and check all the ground connections?

----- Original Message -----
From: "John Clemens" <jbclem@EARTHLINK.NET>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Wednesday, March 21, 2001 6:51 PM
Subject: fuel pressure regultor bad? Engine running rich

> I have a 1983 watercooled and my gas milleage is down to 10 mph, my
air/fuel
> ratio is between 9 and10(should be 14.7).  The only spec I've found so far
> that is off is the fuel pressure reading.  It is .5 Bar(aprox 7 psi) too
> high at idle, both with the fuel pressure regulator vac line on and
> off(actual reading 2.5 Bar and 3.0 Bar).  I've also checked with the fuel
> return line disconnected(to make sure a restriction wasn't causing this
> problem), and the fuel pressure is still .5 Bar too high.
>
> My question is whether .5 Bar(7 psi) is enough of a different to make the
> engine(1.9L) run  so rich.
>
> I'd appreciate any ideas or suggestions about this problem.
>
> John