Fuelab 52501-4 EFI Adjustable Fuel Pressure Regulator -6AN In-Line

The Fuelab 52501-4 is a high-performance adjustable fuel pressure regulator from the 525 Series, designed specifically for EFI (electronic fuel injection) applications. This in-line regulator is engineered for precision fuel delivery and easy installation, even in the most space-constrained engine bays.

Key Features:

• Adjustable pressure range suitable for fuel injected applications up to 125 PSID
• -6AN inlet port and -6AN return port positioned in-line (not on bottom) for easy installation in tight locations
• Fine thread pitch adjustment mechanism for precise pressure tuning
• 1/8 NPT gauge port with plug for external fuel pressure gauge monitoring
• 1/8 NPT pressure reference port with barbed fitting for manifold vacuum/boost reference
• Accepts both port style and non-port style union fittings without interference
• Versatile mounting bracket with stainless steel hardware included

Construction and Compatibility:

• Precision-machined billet aluminum construction
• Military-spec Type II anodized finish (MIL-A-8625) for corrosion resistance
• Compatible with gasoline, diesel, methanol, and ethanol fuels
• Backed by Fuelab's 2-year limited warranty

The 525 Series regulator's unique in-line port configuration makes it ideal for applications where space is limited and traditional bottom-return regulators won't fit. The fine-pitch adjustment threads allow for precise fuel pressure control, critical for optimizing EFI performance and maintaining proper air-fuel ratios.