Fuelab 51501-3 515 Series EFI Adjustable Fuel Pressure Regulator 25-90 PSI Blue

The Fuelab 51501-3 is a 515 Series adjustable EFI fuel pressure regulator engineered for performance and installation flexibility. Designed to cover a 25–90 PSI pressure range, it suits a wide range of electronic fuel injection applications and accepts both port-style and non-port-style union fittings without interference. The regulator features a striking blue anodized billet aluminum body finished to military specification MIL-A-8625, Type II for long-lasting corrosion resistance.

The bottom-mounted -6AN return port keeps plumbing clean and unobstructed, while dual -10AN inlet ports accommodate high-flow fuel system demands. A fine-thread adjustment mechanism delivers precise pressure tuning, and the included 1/8" NPT gauge port with plug allows easy integration of an external fuel pressure gauge. A 1/8" NPT pressure reference port with barbed fitting is also included for vacuum/boost referencing.

Key Features:

• EFI pressure range: 25–90 PSI
• Two -10AN inlet ports and one -6AN return port (bottom-mounted)
• Compatible with gasoline, diesel, methanol, and ethanol
• Billet aluminum body with military-spec anodize — MIL-A-8625, Type II
• Blue anodized finish
• Fine thread pitch for precise, repeatable pressure adjustment
• Accepts port-style and non-port-style union fittings without interference
• 1/8" NPT gauge port with plug for external fuel pressure gauge
• 1/8" NPT pressure reference port with barbed fitting included
• Versatile mounting bracket and stainless steel hardware included
• Backed by a limited lifetime warranty

The Fuelab 515 Series fuel pressure regulator is a top-tier choice for EFI builds, turbo applications, and high-performance street or track fuel systems requiring consistent, adjustable fuel delivery.