Fuelab 51505-4-L-L Series Adjustable Fuel Pressure Regulator - 515

The Fuelab 51505-4-L-L is a 515 Series adjustable fuel pressure regulator engineered for high-performance carbureted and fuel-injected engines. This CARB-compliant regulator features a large seat design and delivers precise fuel pressure control from 1 PSID to 125 PSID, making it versatile enough for a wide range of automotive, marine, and powersports applications.

Key Features:

• Dual -6AN inlet ports and single -6AN return port on bottom for flexible plumbing configurations
• Accepts both port-style and non-port-style union fittings without interference
• Compatible with gasoline, diesel, methanol, and ethanol fuels
• Precision-machined billet aluminum construction with Type II anodizing per MIL-A-8625
• Fine thread pitch adjustment for accurate pressure tuning
• 1/8 NPT gauge port with plug for external fuel pressure gauge installation
• 1/8 NPT pressure reference port with barbed fitting for manifold vacuum/boost connection
• Includes versatile mounting bracket and stainless steel hardware
• Backed by Fuelab's 2-year limited warranty

This large seat regulator provides the flow capacity needed for high-horsepower applications while maintaining consistent fuel pressure. The durable anodized finish resists corrosion and provides long-lasting performance in demanding environments.