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OK... Im picturing it now. I musta been running slow last week. Thanks Russ! Keith > > > > Maybe Im not picturing this right but I wouldnt think a different pump will > > need an adjustment. > > > The "orfice size" is controlled by a spring and a diaphram. Pressure > from the pump comes into the regulator, and presses on a diaphram that > has a spring behind it. If the pressure is higher than the spring > pressure, the diaphram moves away from the orfice making it bigger, > allowing more fuel thru the orfice and back to tank. As the pressure > drops, the diaphram moves closer to the orfice closing it off, therefore > raising the pressure. It does this until it finds a balance. > On our regulators, the adjusting screw just changes the spring tension > on the diaphram. > On modern regulators, mostly, the spring pressure is set by the > manufacturer, and that is where it stays. > > -- > Russ Wolfe > '71 FB AT > '66 FB MT > '65 T1 (not running) > russw@classicvw.org > http://www.classicvw.org > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > ~ Shameless link for search engines: http://listarchive.type3.org ~ > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >