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