Fuelab 51505-2-L-E Series EFI Adjustable Fuel Pressure Regulator Large Seat - 515 6AN/-10AN

The Fuelab 515 Series Adjustable Fuel Pressure Regulator (PN: 51505-2-L-E) is a high-performance EFI fuel pressure regulator engineered with precision and versatility for demanding fuel system applications. Built for fuel-injected systems, this large-seat regulator accepts both port-style and non-port-style union fittings without interference. The 515 Series supports a wide pressure range — from carbureted applications as low as 1 PSID up to fuel-injected applications requiring up to 125 PSID — making it one of the most adaptable regulators on the market. The -6AN return port is conveniently located on the bottom of the unit for clean, efficient plumbing.

Key Features:

• Dual inlet ports: Two -6AN or -10AN inlet ports and one -6AN return port for flexible plumbing configurations
• Broad fuel compatibility: Supports gasoline, diesel, methanol, and ethanol fuel types
• Premium construction: CNC-machined billet aluminum body with military-spec anodizing per MIL-A-8625, Type II for corrosion resistance and durability
• Precise pressure adjustment: Fine thread pitch allows for accurate, repeatable pressure settings
• Easy mounting: Includes a versatile mounting bracket and stainless steel hardware
• Gauge port: 1/8 NPT gauge port with plug for connection of an external fuel pressure gauge
• Pressure reference port: 1/8 NPT pressure reference port with barbed fitting for vacuum/boost referencing
• Warranty: Backed by Fuelab's 2-year limited warranty

The Fuelab 515 Series regulator is the ideal choice for high-performance EFI builds where precise fuel pressure control, quality materials, and long-term reliability are non-negotiable. Its large-seat design ensures consistent flow and pressure regulation across a broad RPM and load range.