<html><head></head><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1471989460895_14344"><span id="yui_3_16_0_ym19_1_1471989460895_14368">Ah so. That makes sense.</span></div><div></div><div id="yui_3_16_0_ym19_1_1471989460895_14343"> </div><div class="signature">Max Welton http://www.maxwelton2k.net/</div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1471989460895_14342"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1471989460895_14337" style="display: block;"> <div style="font-family: verdana, helvetica, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1471989460895_14336"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1471989460895_14335"> <div dir="ltr" id="yui_3_16_0_ym19_1_1471989460895_14338"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1471989460895_14371"> <hr size="1"> <b id="yui_3_16_0_ym19_1_1471989460895_14370"><span style="font-weight:bold;" id="yui_3_16_0_ym19_1_1471989460895_14369">From:</span></b> Jim Adney <jadney@VWType3.org><br> <b><span style="font-weight: bold;">To:</span></b> type3@vwtype3.org <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, August 23, 2016 4:07 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [T3] Fuel pressure and elevation<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1471989460895_14334"><br>On 23 Aug 2016 at 12:47, William J wrote:<br clear="none"><br clear="none">> I don't get how air pressure affects the FPR since it's a closed sealed <br clear="none">> system . <br clear="none"><br clear="none">Assuming FPR stands for fuel pressure regulator, the answer is that <br clear="none">it's not a closed system. The non-fuel side of the pressure regulator <br clear="none">has a vent hole to atmosphere. The spring provides about half the <br clear="none">force needed to hold the fuel pressure in regulation; the other half <br clear="none">is provided by atmospheric air pressure, which changes with altitude <br clear="none">and barometric pressure.<br clear="none"><br clear="none">So, the answer is that you should set your fuel pressure at low <br clear="none">altitude on a day that is neither high nor low in barometric <br clear="none">pressure.<br clear="none"><br clear="none">Gas regulators, like those on oxygen bottles and also those that <br clear="none">regulate your natural gas lines, are designed to give you a set <br clear="none">pressure difference between atmospheric and the gas. Absolute <br clear="none">pressure regulators exist, and they work by having a sealed volume <br clear="none">behind the diaphram. They are VERY expensive.<br clear="none"><br clear="none">Sounds like, thanks to Daniel, we've learned a serious lesson here.<div class="yqt9615069903" id="yqtfd82730"><br clear="none"><br clear="none">-- <br clear="none">*******************************<br clear="none">Jim Adney, <a shape="rect" ymailto="mailto:jadney@vwtype3.org" href="mailto:jadney@vwtype3.org">jadney@vwtype3.org</a><br clear="none">Madison, Wisconsin, USA<br clear="none">*******************************<br clear="none"><br clear="none">_______________________________________________<br clear="none">VWType3.Org mailing list - <a shape="rect" ymailto="mailto:type3@vwtype3.org" href="mailto:type3@vwtype3.org">type3@vwtype3.org</a><br clear="none">To unsubscribe or change subscription options, visit:<br clear="none"><a shape="rect" href="http://lists.vwtype3.org/listinfo.cgi/type3-vwtype3.org" target="_blank">http://lists.vwtype3.org/listinfo.cgi/type3-vwtype3.org</a><br clear="none">If you need more help, contact: <a shape="rect" ymailto="mailto:gregm@vwtype3.org" href="mailto:gregm@vwtype3.org">gregm@vwtype3.org</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>