The AEM High Capacity Adjustable Fuel Pressure Regulator 25-305BK is designed to maintain precise fuel control in high-performance and forced-induction engines. Built for race and high-output applications, this universal regulator features a large return orifice and a 1:1 rising pressure rate to ensure consistent fuel delivery even under extreme boost and high-pressure conditions.

Constructed from high-grade materials and finished in a durable black anodized coating, the 25-305BK combines strength, corrosion resistance, and sleek appearance. Its 9/16"-18 O-ring sealed inlet and return ports are compatible with -6 AN fittings for secure, leak-free connections. A dedicated 1/8-inch NPT port allows integration of a fuel pressure gauge or sensor, giving tuners real-time monitoring and precise adjustment capabilities.

Engineered to perform with both alcohol-based and race fuels, this regulator provides exceptional flow capacity and stability, making it ideal for custom builds, track cars, and high-horsepower street applications. The compact design supports flexible mounting and ensures reliable performance across a variety of fuel system configurations.

Features:

• Large return orifice optimized for high-volume fuel pumps and flow rates

• 1:1 rising pressure rate maintains stability in boosted applications

• Compatible with alcohol, E85, and race fuels

• 9/16"-18 O-ring sealed inlet and return ports accept -6 AN fittings

• 1/8-inch NPT port allows connection of a fuel pressure gauge or sensor

• Durable black anodized construction ensures corrosion resistance and longevity

• Compact, universal design suitable for custom or racing fuel systems