Fuelab 51505-3-L-E Series EFI Adjustable Fuel Pressure Regulator Large Seat - 515 Black

The Fuelab 51505-3-L-E 515 Series Adjustable Fuel Pressure Regulator is engineered for high-performance EFI applications, delivering precise and reliable fuel pressure control. Built from billet aluminum with a military-spec anodize finish (MIL-A-8625, Type II), this regulator combines durability with competition-grade performance. The large seat configuration supports fuel injected applications up to 125 PSID, while the fine thread pitch adjustment allows for highly accurate pressure tuning.

Designed with versatility in mind, the 515 Series accepts both port-style and non-port-style union fittings without interference. Twin inlet ports accommodate -6AN or -10AN fittings, and the dedicated -6AN return port is conveniently located on the bottom of the unit. A 1/8 NPT gauge port (plug included) allows easy connection of an external fuel pressure gauge, and a 1/8 NPT pressure reference port with barbed fitting supports boost-referenced fuel pressure setups.

Key Features:

• EFI application — supports fuel injected systems up to 125 PSID
• Large seat design for high-flow performance
• Two -6AN or -10AN inlet ports and one -6AN return port (bottom-mounted)
• Compatible with gasoline, diesel, methanol, and ethanol fuels
• Billet aluminum construction with military-spec anodize (MIL-A-8625, Type II) in black
• Fine thread pitch for precise pressure adjustment
• 1/8 NPT gauge port with plug for external fuel pressure gauge
• 1/8 NPT pressure reference port with barbed fitting
• Includes versatile mounting bracket and stainless steel hardware
• Backed by Fuelab's 2-year limited warranty

The Fuelab 515 Series fuel pressure regulator is an ideal solution for builders seeking a precision-machined, multi-fuel compatible regulator for EFI performance builds on the street or strip.