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On Mon, 2005-02-07 at 01:48, Jens Vagelpohl wrote: > On Feb 7, 2005, at 0:50, Russ Wolfe wrote: > >> This would only work if there was air to compress and "soak up" the > >> pulses I'm thinking. It's all filled with incompressible gasoline, so > >> how the fluctutions on the inlet side can be different than the ones > >> on > >> the outlet side I don't know... > >> > > But, just look at the design of the diaphram. The sides of the diaphram > > at very flat compared to their diameter. They can flex in and out, > > therefore absorbing shock/pulses in the system. > > You mean the outside walls themselves can bulge in and out? I didn't > know the pump created that much pressure ;) > Our pumps can produce over 60 psi. That is all my gauge went to, and it damaged the gauge. I wanted to see just how much they can do. As for the diaphram, It is more of a high frequency thing. When they first came out with the FI, they didn't want th customers to hear the pump up under the tank. Remember, our FI system was just about the first FI system on a volume production car. -- Russ Wolfe '71 FB AT '66 FB MT '64 T34 (not running) '65 T1 (not running) russw@classicvw.org http://www.classicvw.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~