AEM High-Capacity Adjustable Fuel Pressure Regulator (40-130 PSI, -6AN, E85) – Universal for Turbo and Competition Engines
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Questions about this product?
The AEM 25-305BK is a high-performance fuel pressure regulator designed for systems that demand high flow and stability. It incorporates an oversized return orifice and a long-travel spring that eliminate pressure fluctuations even with 400 LPH or higher pumps. Perfect for turbo engines, competition builds and any project that needs to maintain constant pressure under extreme conditions.
Features
- 40 to 130 PSI range (2.76 – 8.96 bar) — Long spring that allows precise adjustments without loss of stability.
- Large return orifice — Manages high-flow pumps with no creep or unwanted pressure rises.
- 1:1 rise ratio — Automatically raises fuel pressure in parallel with turbo or supercharger pressure.
- Compatible with E85, methanol and racing fuels — Internal materials resistant to corrosion from aggressive fuels.
- CNC-machined 6061-T6 billet aluminum body — Black anodized, robust and with a professional finish.
Technical specifications
- Reference: AEM 25-305BK
- Pressure range: 40 – 130 PSI (2.76 – 8.96 bar)
- Inlet ports: 2 × -6AN ORB (9/16"-18)
- Return port: 1 × -6AN ORB (9/16"-18)
- Gauge port: 1/8" NPT
- Vacuum/boost connection: 3/16" (5 mm)
- Factory setting: 40 PSI
- Material: 6061-T6 billet aluminum
- Finish: Black anodized
Compatibility
Universal. It adapts to EFI (electronic fuel injection) and high-pressure carburetion systems. Optimized for turbo, supercharged and high-power naturally aspirated engines. Compatible with gasoline, E85, ethanol, methanol and racing fuels.
Why the High Capacity model?
Unlike standard regulators (such as the AEM 25-302BK), the 25-305BK eliminates the creep that appears with high-flow pumps (+400 LPH). Its one-piece return orifice ensures that excess fuel returns to the tank without restrictions, keeping the injector rail stable at all times.
Frequently asked questions
- Is it compatible with E85? Yes, all internal components resist corrosion from alcohol-based fuels.
- Does it include a gauge? No, but it incorporates a standard 1/8" NPT port to install the gauge of your choice.
- Is it suitable for daily use? Yes, it works perfectly both on the street and on the track.
Package contents
- 1 × AEM 25-305BK pressure regulator
- 1 × Universal mounting bracket
- 4 × Mounting screws
Shipping and warranty
In stock. Fast shipping and guaranteed compatibility with systems that use -6AN connections.