Fuel Press Reg In-Line EFI 25-90psi 6AN/6AN

The Fuel Press Reg In-Line EFI 25-90psi 6AN/6AN from FUELAB Fuel Systems is a precision inline fuel pressure regulator engineered for serious engine builders and performance enthusiasts who demand reliable fuel management across a wide range of fuel types. Whether you're tuning a naturally aspirated gasoline engine, running E85 on a forced-induction setup, or experimenting with alternative fuels like methanol or diesel, this regulator maintains consistent pressure delivery to your EFI system. Built for both street and race applications, it solves the critical problem of fuel pressure stability—inconsistent pressure leads to poor idle quality, hesitation, and unreliable AFR control that even the best tuning software cannot fully correct.

This inline regulator features dual 6 AN female ports—one for fuel inlet and one for return—allowing integration into custom fuel systems without bulky fittings or adapters that restrict flow. The 25–90 PSI adjustable range covers everything from stock carbureted baseline pressures to modern direct-injection and boosted applications, with an included 1/8 inch NPT port for vacuum reference or pressure signal tap connections. The aluminum body is black anodized for corrosion resistance and professional appearance, and the regulator is fuel-compatible with gasoline, E85, diesel, and methanol—critical for builders who swap fuels or run seasonal blends. Weighing just 0.99 pounds and measuring 4.95 x 2.85 x 5.05 inches, it mounts inline on any fuel rail setup without excessive packaging constraints.

Mechanics and tuners installing standalone ECUs, upgrading fuel systems on carbureted-to-EFI conversions, or troubleshooting pressure issues on modified engines will find this regulator indispensable for setting and maintaining accurate fuel delivery. It's ideal for vehicles running Holley Terminator, Megasquirt, or OEM-integrated EFI systems that require external pressure regulation. Installation requires compatible fuel hose rated for your pressure band and appropriate AN fittings; the regulator integrates seamlessly into fuel systems using braided stainless or synthetic hose. No external power is needed—regulation occurs passively through spring tension and return-line flow, making it reliable on long road trips, dyno sessions, or sustained high-RPM tuning runs.