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On Wed, 2002-09-18 at 19:46, Everett Barnes wrote: > > My Crap Brazillian stamped out modern pump will pump 2.5PSI but when Im on > the gas heavily it will lose a pound or so and regain it when I let off.... > > > I pulled apart what I thought was an original dual carb. Type 3 fuel pump > today to compare it against an NOS single carb. fuel pump rebuild kit I > have, the springs on the fuel pump diaphragms looked identical. I was > expecting the dual carb. one to be beefier to spit out 5 psi vs. the single > carb.'s weaker pressure. > > I'm not sure if that determines anything, maybe what I thought was an > original dual carb. fuel pump was just a Bug one that someone rotated the > top 1/2 on to get it in the "correct" Type 3 position. > When we needed to lower the fuel pressure in VW's, we would add another gasket or 2 under the fuel pump. So, if you remove a gasket, then you would raise the pressure. SO, maybe the difference is not in the spring/diaphram, but in the housing dimensions. -- Russ Wolfe '66 FB MT (It drove) '71 FB AT '65 Bug (not running) russw@classicvw.org http://www.classicvw.org ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/