Fuelab 52503-1-L-E EFI Fuel Pressure Regulator Series In-Line Large Seat - 525

The Fuelab 525 Series Adjustable Fuel Pressure Regulator is engineered for high-performance EFI applications requiring precise fuel delivery control. Featuring an in-line design with a large seat, this regulator accepts both port style and non-port style union fittings without interference, providing maximum installation flexibility.

Key Features:

• In-line configuration with -6AN inlet and -6AN return port for easy installation in tight spaces
• Adjustable pressure range up to 125 PSID for fuel injected applications
• Compatible with gasoline, diesel, methanol, and ethanol fuels
• Precision-machined billet aluminum construction with Type II military-spec anodizing (MIL-A-8625)
• Fine thread pitch adjustment for precise pressure tuning
• 1/8 NPT gauge port with plug for external pressure monitoring
• 1/8 NPT pressure reference port with included barbed fitting
• Versatile mounting bracket with stainless steel hardware included
• Backed by Fuelab's 2-year limited warranty

The 525 Series regulator's unique in-line return port design positions the return outlet parallel to the inlet rather than on the bottom, making it ideal for space-constrained engine bays. Built to withstand the demands of high-performance fuel systems, this regulator delivers reliable pressure control for modern EFI setups.