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On Sun, 2004-07-25 at 20:03, Keith Park wrote: > > > If the pump has a different flow rate, or can produce more or less > pressure... wouldnt that change the orifice size needed to keep the pressure > at 30? > > 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 ~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~