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<x-charset iso-8859-1>> The Elfrink manual clearly describes the operation of both types. It calls out the pressure for both types as 4.5 psi max (with the outlet plugged past the gauge). The manual says the pressure is directly related to the main diaphragm spring pressure. Everett, didn't you tell me the spring could be tweeked? > My '65 shop manuals says: "The pump pressure is determined by the adjustment of the push rod stroke and the diaphragm spring tension. The push rod stroke is adjusted by adding or removing flange gaskets as describe under... If the stroke adjustment does not give the desired result, replace the diaphragm spring. Otherwise, if the pump pressure is too high, the intermediate turns of the spring may be coiled closer together, and if the pump pressure is too low they may be stretched apart." So I guess you should adjust the stroke first. It says the fuel pump pressure should be 4.5 psi at 3800 rpms with the needle valve closed. -- Everett Barnes everettb@thesamba.com http://www.thesamba.com ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/ </x-charset>