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check for engraving on the piece, kinda like the egr systems labeling off the vack line with the arrow and the other line, or just an idea but, try to do a web search on that product or a similar FPR check out summit or some places like that, others should show you which way what goes good luck !!
in order for it to work like you would need it to you will have to get an external fuel pump.....otherwise the regulator isnt gonna serve any purpose because of the stock regulator on the stock pump