Let me give it a try.  The vacuum in the box would cause the gauge to read
absolute pressure instead of psig (psi gauge).
I think a fuel pressure gauge is probably over-kill.  If you run a
mechanical set-up, you are risking a gas leak anywhere from the engine to
the dash, and most electrical would not be accurate enough to see the
difference between 29 and 34 psig  IMHO.  I'd take the guage money and
replace the regulator.
                                                   Jay '85 Westy (w/new
regulator)

Bill Davidson <wdavidson@THEGRID.NET> on 02/06/2001 01:43:59 PM

Please respond to Bill Davidson <wdavidson@THEGRID.NET>

To:   vanagon@GERRY.VANAGON.COM
cc:    (bcc: Jay L Snyder/AE/DuPont)
Subject:  Re: fuel pressure test connection size?

> Just a thought -- if you mount your gauge in a sealed box you could
connect
> that to the manifold pressure.  That would give you a direct-reading
gauge
> that would tell you what the fuel pressure really is without having to
> connect a manifold pressure gauge and do a bunch of subtracting...
Sealed Box? I don't follow... please explain...
Thanks,
Bill