Fuelab Fuel Injection Pressure Regulator

Fuelab Fuel Injection Pressure Regulators: Precision Built for EFI Performance

When it comes to dialing in an EFI fuel system, few components are as critical — or as often overlooked — as the fuel injection pressure regulator. An imprecise regulator means inconsistent fuel pressure, poor atomization, and ultimately, lost power and efficiency. Fuelab has built its reputation around solving this problem, offering a lineup of fuel injection pressure regulators that combine precision engineering, broad compatibility, and long-term durability for street, strip, and race applications alike.

Purpose-Built Series for EFI Applications

Fuelab's EFI regulator lineup is anchored by several distinct series, each targeting a specific performance tier. The 515 Series is their cornerstone EFI regulator, designed with dual -6AN inlet ports and a -6AN return port, covering a pressure range of 25–90 PSI — a sweet spot that handles the vast majority of modern EFI builds. These regulators are constructed from billet aluminum with anodizing per military MIL-A-8625, Type II, and feature fine thread pitch for precise pressure adjustment, plus both a 1/8" NPT gauge port and a pressure reference port for easy monitoring.

For high-horsepower builds demanding even greater flow capacity, the 565 Pro Series steps up significantly. The 565 Series shares all the great features of the 515/525 Series but adds extreme capacity through a massive 1/2" return orifice and -10AN ports — a configuration that removes flow restrictions for builds pushing the limits of power.

On the cutting edge, Fuelab's 529 Series Electronic Fuel Pressure Regulators represent a fundamentally different approach to fuel pressure control. These electronic regulators work directly with the Prodigy line of fuel pumps to reduce heat build-up and vapor lock conditions, sending a signal to the Prodigy pump to actively control return line flow rate. With this demand-based system, true pump control is achievable and easy to install, with super fast response time, operating as an independent system requiring no calibration.

Multi-Fuel Compatibility and Build Quality

Bypass, blocking, and electronically controlled regulators are all based on using the best quality components and proprietary materials to deliver precise, stable fuel control. Critically, Fuelab EFI regulators are compatible with gasoline, diesel, methanol, and ethanol — making them a practical choice for flex-fuel, E85, or methanol-injected builds without requiring separate hardware. Fuelab regulators are smaller, lighter, and can handle 1,800 HP+ for carbureted or EFI applications.

The "Forever Fixed" Lifetime Warranty

One of the most compelling reasons to choose Fuelab regulators is the brand's commitment to standing behind their products long after the sale. Fuelab launched a "Forever Fixed" lifetime warranty covering the original purchaser against all material or workmanship defects for the life of the product. For a precision component like a fuel pressure regulator — one that lives under the hood in demanding thermal and pressure environments — this level of coverage is a meaningful differentiator from the competition.

Whether you're building a track-day car, a high-horsepower street machine, or a purpose-built race vehicle, Fuelab's fuel injection pressure regulators offer the precision, durability, and multi-fuel flexibility that serious builders demand. Explore the full Fuelab brand lineup to see how their regulators fit into a complete, optimized fuel system.