The GFB FX-S delivers reliable fuel pressure management for high-performance EFI setups. Built for precision and flexibility, it’s fully serviceable and compatible with a wide range of fuels and system layouts.

Key Features

• 4x 1/8” NPT ports for fuel inlets, pressure gauge, or ECU sensors
• 1x 1/8” NPT return port for standard or custom fuel line routing
• 750 LPH flow capacity at 25psi – handles everything from single pumps to triple setups
• 1:1 fuel pressure rise rate for consistent tuning and performance
• Double-layer diaphragm with reinforced material rated to over 500psi burst pressure
• Teflon co-polymer valve seat with spherical stainless valve – retains pressure on shut down
• Adjustable static pressure from 25psi to 80psi (spring preload screw is O-ring sealed)
• Suitable for pump gas, Ethanol, Methanol, and Diesel
• Fully serviceable design

Engineered for Precision and Reliability

The GFB FX Series of EFI fuel pressure regulators are built on the same standards of engineering excellence that have made our products trusted worldwide. Whether your system is mild or extreme, the FX-S offers the flexibility, performance, and durability you need.

What sets the FX range apart? Many aftermarket regulators use metal-to-metal valve seats that struggle to hold pressure once the engine shuts down—this can cause hard starts and inconsistent fuel pressure. Our solution? A replaceable, co-polymer valve seat that maintains a positive seal for reliable fuel pressure retention and smooth engine starts every time.

Built to Withstand the Pressure

The FX-S is equipped with a double-layer diaphragm, providing twice the reinforcement of typical regulators. This robust construction results in a burst pressure rating of over 500psi.

Adaptable for Any Setup

Thanks to multiple inlet and gauge ports, the FX-S supports a variety of fuel system layouts—from conventional inlet/outlet routing to parallel fuel rails or returnless “deadhead” configurations. You can even run a mechanical gauge and an ECU sensor at the same time using the dual gauge ports.

For high flow, high reliability, and smart design, the GFB FX-S is the go-to solution for serious tuners and performance builders.