GFB FX-S 8051 – Take Fuel Control Further Than the Factory Regulator Can

The FX-S 8051 is a high-performance drop-in upgrade for Bosch clip-in fuel pressure regulators, delivering superior flow, pressure control, and reliability—without needing to replace the entire fuel rail.

Key Features

• Direct-fit replacement for Bosch clip-in regulators (see fitment section)
• 1/8″ NPT port for fuel pressure gauge or sensor
• More than double the flow of a standard Bosch regulator—supports higher-capacity fuel pumps
• Compatible with pump gas, ethanol, and methanol
• Reinforced dual-layer diaphragm with burst strength exceeding 500psi
• Soft Teflon co-polymer valve seat with stainless valve for better shut-down pressure retention
• Fully adjustable static pressure from 1.4–5 bar (20–72 psi), depending on pump flow and return line restrictions
• Leak-free vacuum/boost seal via O-ring sealed spring preload platform
• Completely serviceable design

Smart Fuel Control for Performance Builds

Upgrading your fuel pump is a great first step when boosting engine output, but that often leads to excessive fuel pressure—especially at idle. That’s because standard Bosch regulators can’t handle the higher flow rates required by larger pumps and E85 turbo setups.

The FX-S 8051 solves this problem by delivering dramatically higher flow capacity, enabling proper fuel pressure control without the need for rail replacements or external regulator setups. Simply clip it into the factory fuel rail for a cleaner and easier install.

Adjustable and Built to Last

Unlike fixed-pressure Bosch regulators, the FX-S 8051 is fully adjustable from 1.4 to 5 bar. It also uses a soft-sealing Teflon seat instead of metal-on-metal contact, ensuring consistent sealing and fuel pressure retention after engine shutdown—for more reliable startups.

The reinforced diaphragm features double the material of most competitors, giving it burst resistance over 500 psi. And with the included 1/8” NPT port, you can easily fit a fuel pressure gauge, sensor, or just plug it with the included cap.