I think you got the connected/disconected numbers reversed. Vacuum has to
make the pressure go down. Physics.

As for readings being off by a few psi, I would suspect the gauge. It
doesn't matter anyway. The only real failure these things have is a bad
diaphram causing fuel to be pumped into the manifold via that vacuum hose.

Dennis

>From: "Mike \"Rocket J Squirrel\" Elliott" <camping.elliott@GMAIL.COM>
>Reply-To: "Mike \"Rocket J Squirrel\" Elliott" <camping.elliott@GMAIL.COM>
>To: vanagon@GERRY.VANAGON.COM
>Subject: What's up with my fuel pressure?
>Date: Wed, 24 Oct 2007 10:48:50 -0700
>
>I'm my ongoing effort to sort out an intermittent problem, I measured
>the fuel pressure in my 1.9l per Bentley's 24.25
>
>With Vacuum Hose 2 connected, the pressure should be 29psi, I got 35psi.
>
>With Vacuum Hose 2 disconnected, should be 36psi, got 32psi and rpms
>increased.
>
>Bad pressure regulator?
>
>--
>
>Mike "Rocket J Squirrel" Elliott
>71 Type 2: the Wonderbus
>84 Westfalia: Mellow Yellow ("The Electrical Banana")
>74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
>KG6RCR