Fuelab 52503-4-L-L Adjustable Fuel Pressure Regulator 525 Series In-Line

The Fuelab 525 Series Adjustable Fuel Pressure Regulator is engineered for high-performance fuel system applications requiring precise pressure control. This CARB-compliant in-line regulator features a large seat design and accepts both port-style and non-port-style union fittings without interference. Supporting pressure ranges from as low as 1 PSID for carbureted applications up to 125 PSID for fuel injection systems, the 525 Series delivers exceptional versatility across multiple fuel system configurations.

Key Features:

• In-line design with -6AN inlet and -6AN return port aligned for easy installation in tight spaces
• Fine thread pitch adjustment mechanism for precise pressure tuning
• Compatible with gasoline, diesel, methanol, and ethanol fuels
• Billet aluminum construction with Type II anodizing per military spec MIL-A-8625
• 1/8 NPT gauge port with plug for external pressure gauge installation
• 1/8 NPT pressure reference port with barbed fitting included
• Versatile mounting bracket with stainless steel hardware
• Backed by 2-year limited manufacturer warranty

The unique in-line return port configuration (positioned alongside the inlet rather than on the bottom) makes this regulator ideal for installations where space is limited. The robust billet aluminum body and military-grade anodizing ensure long-lasting durability in demanding automotive, racing, and performance applications.