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On 20 Nov 2005 at 18:05, David Y wrote: > I tried to blow through the output tube, and could not force any air/gas > back through, which I believe means the valves aren't stuck (?). There is > little if any resistance blowing the other way (through the input tube). There are 2 valves in series in these pumps, so only one would have to be good for it to seal backwards. Besides, the leak necessary would only be very small, so you might not even notice it. Maybe with a soap bubble on the inlet pipe you could see something. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~