Fuelab 525 EFI Adjustable FPR In-Line 25-90 PSI (1) -6AN In (1) -6AN Return - Black - 52501-1

Fuelab 525 Series In-Line EFI Fuel Pressure Regulator — Black (52501-1)

An adjustable in-line regulator with a 25-90 psi range, which is a wider window than most units in this class — that ceiling matters if you're running elevated base pressure on a big-injector setup where a 50 or 75 psi regulator runs out of adjustment.

Billet aluminum body, black anodized, with boost and vacuum reference so fuel pressure tracks manifold pressure 1:1. Return style.

One -6AN inlet and one -6AN return port. The single-inlet layout keeps the package small, which is the reason to pick this over a two-port body when engine bay space is the constraint.

Right-sized for: most single-pump port injection systems. If you're feeding it with dual pumps or a large gear pump, step to a higher-flow regulator instead.

Not legal for use on emissions-controlled vehicles — uncontrolled or closed-competition use only.

Sold each.