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Hello,
I have never heard of this procedure.
What exact fuel pump are you using?
I will only install the Pierburg mechanical fuel pump that Volvo sells as a new replacement pump with SUs. I will also use an original AC Delco glass bowl pump or 1 of the earlier styles of Pierburg fuel pumps.
I have seen several other manufacturers of mechanical fuel pump that had cheap fuel pump check valves and 1 had almost 7psi of pressure and that is way too high.
The only decent low pressure fuel pressure regulator is a Holley brand if you have an electric pump or an overpressizing mechanical pump.
BTW, All of the mechanical fuel pumps REQUIRE the spacer and 2 gaskets!!
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Eric Hi Performance Automotive Service (formerly OVO or Old Volvos Only) Torrance, CA 90502
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