GFB FX-S 8051 Fuel Pressure Regulator – Bosch Replacement

FX-S 8051 is compatible with pump gas, Ethanol, or Methanol

Direct drop-in replacement upgrade for common Bosch clip-in fuel pressure regulators

Takes over where the factory regulator stops.

The popular and compact GFB FX-S Fuel Pressure Regulator is now available as a direct drop-in replacement for common Bosch clip-in fuel pressure regulators (e.g. Audi/VW/Seat/Skoda 1.8T). Designed for high-performance applications, the FX-S 8051 delivers significantly higher flow capacity while retaining the factory fuel rail, making it the ideal solution for upgraded fuel pump setups and high-demand engines.

Features & Benefits:

Direct fit replacement for Bosch clip-in fuel pressure regulators
More than double the flow capacity of the factory regulator
Allows increased fuel pump capacity without replacing the OEM fuel rail
Compatible with gasoline, ethanol (E85), and methanol
Double-layer, double-reinforced diaphragm with burst strength exceeding 1000 psi
Teflon co-polymer valve seat with stainless steel valve for superior sealing and pressure retention after shutdown
O-ring sealed spring pre-load adjustment platform – no vacuum or boost leaks
Adjustable static fuel pressure from 1.4 to 5.0 bar (20–72 psi, depending on pump flow and return line restriction)
Fully serviceable design for long-term reliability
1/8” NPT port for fuel pressure gauge or electronic pressure sensor (plug included)

If you increase engine performance, your fuel system must keep up. While upgrading the fuel pump is often the first step, factory Bosch regulators frequently lack the flow capacity required for larger pumps—especially in turbocharged E85 applications. The FX-S 8051 solves this issue without the need for fuel rail replacement or external regulator conversions, offering precise adjustability and reliable pressure control.

Like all GFB FX regulators, the FX-S 8051 ensures consistent fuel pressure, excellent sealing, and reliable engine starts—no matter the fuel or performance level.

Features