AEM High Capacity Universal Black Adjustable Fuel Pressure Regulator

AEM High Capacity Universal Adjustable Fuel Pressure Regulator (Black) | 25-305BK

Upgrade your fuel system with the AEM High Capacity Universal Black Adjustable Fuel Pressure Regulator (PN 25-305BK). Supports 40–130 PSI, 1:1 boost reference, and high-flow race fuels.

The AEM High Capacity Universal Black Adjustable Fuel Pressure Regulator (Part # 25-305BK) is engineered to meet the extreme fuel demands of high-horsepower, boosted, and motorsport applications. CNC-machined from lightweight 6061-T6 billet aluminum and finished in a sleek black anodized coating, this regulator delivers precise fuel control under high-stress conditions.

Equipped with an extended internal spring, it provides an ultra-wide adjustment range from 40 to 130 PSI, allowing custom tuning for modified engine builds. It features a 1:1 rising rate reference port, ensuring fuel pressure increases proportionally to manifold boost. With three -6AN (9/16"-18) ORB O-ring sealed ports (two inlet and one return) along with a 1/8" NPT port for a fuel pressure gauge or sensor, the AEM High-Cap Regulator offers versatility and reliability for demanding fuel delivery setups.

Best Uses

1. High-Boost & Forced Induction Builds: Perfect for turbocharged and supercharged engines that require a reliable 1:1 boost-dependent fuel pressure rise.
2. High-Flow Fuel Pump Systems: Handles high-volume, high-LPH aftermarket fuel pumps without pressure spikes or idle issues.
3. Race Fuel & Alcohol Conversions: Fully compatible with aggressive fuels like E85, methanol, and high-octane race gas.
4. Custom Performance Engine Swaps: Universal design and custom mounting bracket enable seamless integration into bespoke fuel rails and engine bays.
5. Track & Drag Racing Applications: Built for harsh racing environments requiring stable, adjustable fuel delivery across extreme RPM ranges.

Features

1. Wide Adjustment Range (40–130 PSI): Incorporates a longer internal spring design, granting accurate pressure adjustments across a broad range for varying performance needs.
2. 1:1 Boost-Dependent Pressure Ratio: Increases fuel pressure in direct 1:1 proportion to manifold pressure, maintaining proper air/fuel ratios under boost.
3. Billet 6061-T6 Aluminum Construction: Precision CNC-machined and finished with a durable black anodized coating for corrosion resistance and strength.
4. Versatile Port Configuration: Features three -6AN (9/16"-18) ORB O-ring style ports (2 inlet, 1 return) for leak-free fuel plumbing.
5. Integrated Gauge/Sensor Port: Includes a dedicated 1/8" NPT port to mount a fuel pressure gauge or EFI pressure transducer directly to the unit.

Benefits

1. Prevents Fuel Starvation: Maintains stable fuel pressure during aggressive acceleration and maximum engine loads.
2. E85 & Alternative Fuel Compatibility: Resistant to chemical degradation from alcohol-based fuels (E85/Methanol) and race gas, ensuring long-term diaphragm life.
3. Smooth Engine Idle & Deceleration Control: High-capacity return orifice accommodates massive fuel pump volumes, eliminating pressure spikes during quick throttle lift-offs.
4. Universal Fitment & Clean Installation: Compact footprint with an included multi-position mounting bracket allows flexible placement in crowded engine bays.
5. Real-Time Monitoring Capability: Direct-mount 1/8" NPT gauge port makes fuel pressure checks and tuning quick and effortless.