FUELAB 52501-1 In-Line Fuel Pressure Regulator EFI 25-90 PSI

Vehicle Fitment

• Universal fuel system component for EFI applications using a return-style fuel system
• Compatible with custom fuel systems using 1x -6AN inlet and 1x -6AN return connection
• For gasoline, diesel, ethanol, and methanol fuel applications as supported by the manufacturer
• Not a vehicle-specific OE replacement part; fitment must be verified for fuel system layout, line size, mounting space, and pressure requirements before purchase

Features

• FUELAB 525 Series in-line bypass fuel pressure regulator
• Designed for EFI applications with adjustable 25-90 PSI operating range
• In-line return-style layout helps simplify plumbing in tight mounting locations
• Single feed and single return design in a compact regulator body
• Boost/vacuum reference port supports manifold-referenced pressure control
• 1/8 in NPT gauge port allows connection of a mechanical pressure gauge or sensor
• Black anodized finish for corrosion resistance and clean engine bay appearance
• Billet aluminum construction for durability and reduced weight
• Fine thread pitch adjustment allows precise fuel pressure tuning
• Accepts port-style and non-port-style union fittings without interference

Specifications

• Part Number: 52501-1
• Series: 525 Series
• Product Type: In-Line Fuel Pressure Regulator
• Regulator Style: Return / Bypass
• Application: EFI
• Pressure Range: 25-90 PSI
• Inlet Quantity: 1
• Inlet Size: -6AN
• Outlet/Return Quantity: 1
• Outlet/Return Size: -6AN
• Gauge Port: 1x 1/8 in NPT
• Reference Port: Boost/Vacuum reference provision
• Seat Size: Standard
• Finish: Black anodized
• Material: Billet aluminum
• Position: In-line

Included Components

• 1x FUELAB 525 Series in-line fuel pressure regulator
• 1x Mounting bracket
• 1x Stainless hardware kit
• 1x Port plug for gauge/reference provision as applicable

Product Description

The FUELAB 52501-1 is a compact in-line EFI bypass fuel pressure regulator built for custom return-style fuel systems that need stable, adjustable pressure control in a space-efficient package. It features a 25-90 PSI adjustment range, 1x -6AN inlet, and 1x -6AN return, making it well suited for performance street, race, off-road, and marine fuel system builds using compatible plumbing and fuel delivery components.

Its in-line design places the return port in line with the inlet to help simplify installation where mounting space is limited. The billet aluminum body, black anodized finish, fine-thread adjustment, boost/vacuum reference capability, and 1/8 in NPT gauge port make it a strong choice for tunable EFI fuel systems running gasoline, diesel, ethanol, or methanol. This is a universal fuel system component and must not be assigned to a specific vehicle without confirming fuel system design, line routing, pressure targets, and available mounting clearance. This product can affect engine tuning and is intended for racing, off-road, or marine use only where applicable. No lift or drop height applies to this product because it is a fuel system component, not a suspension part.