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> > This prevents surges on the downstream side. > > That only works because the total lake volume can vary slightly. Think of the pulses/vibration in acoustic terms. The case walls need not flex to have a marked impact on the actual "sound" being carried along with the flow of fuel. I presume we're discussing one of these? in v _| |________ |________ _| | | v out The chamber could set up enough acoustic reflections to phase out a good deal of the carried signal, sort of like a super simplified muffler without concern over scavenging/back-pressure. I would guess that this would "look like" a really big choke to some resonant frequency hitching a ride on the liquid. That said, I like to be able to hear my pump loud and clear. Have fun, Curtis http://binauralaboratories.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~