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From the Y-block, the main feed line travels through a Fore Precision Works 10-micron fuel filter (PN 0100-100; $79) up to a Fore F4 Fuel Pressure Regulator (PN FPW-F4REG; $269). The regulator is boost referenced to step up pressure for one pound per pound of boost. To set the base pressure, the key was turned on to run the pumps but the engine wasn’t started so the diaphragm wasn’t under the influence of vacuum. Under the advice of tuner Jon Lund, Jesse set the base pressure at 55 psi.