AEM Electronics Adjustable Fuel Pressure Regulator - High Capacity / Universal - 2 inlets, 1 return
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This AEM Electronics High Capacity Universal Adjustable Fuel Pressure Regulator is designed for high-performance EFI engines needing stable fuel flow, even under high boost. It offers custom base pressure settings for specific applications, a wide adjustment range, and supports very high flow rates. While versatile, ensure proper fitting and understanding of boost referencing for optimal performance.
All features
| Model Part Number | 25-305BK |
|---|---|
| Brand | AEM Electronics |
Extended Product Information
FAQs
What is the adjustment range for the base fuel pressure?
The regulator offers a wide adjustment range from 40 PSI to 130 PSI, thanks to its longer internal spring.
What does '1:1 boost referenced' mean?
It means that for every 1 PSI of boost pressure detected by the regulator's reference line, the fuel pressure will increase by 1 PSI above the set base pressure. This helps maintain a consistent fuel/air ratio under boost.
Can this regulator be used with E85 fuel?
Yes, the regulator is compatible with alcohol fuels, including E85, as well as standard gasoline and race gas.
How many fuel inlet and return ports does it have?
It features three -6AN (9/16" -18) ORB ports: two are designated for fuel inlet, and one is for the fuel return line.
What material is the regulator made from?
The regulator is CNC-machined from durable 6061-T6 billet aluminum and features an anodised black finish for corrosion resistance and styling.
Does it come with the necessary fittings?
Yes, comprehensive installation instructions and fitting hardware are included with the regulator.
Can I install a fuel pressure gauge directly to this regulator?
Yes, the regulator includes an integrated 1/8" NPT gauge port for easy installation of a fuel pressure gauge.
Troubleshooting
Fuel pressure is inconsistent or fluctuates.
Ensure the fuel pump is adequate for the demand. Check for any restrictions in the fuel lines or filter. Verify the fuel return line is not kinked or obstructed and is correctly plumbed. Ensure the boost reference line is securely connected and not leaking.
Cannot achieve desired base fuel pressure.
Verify the adjustment screw is turning correctly. Ensure the spring is not damaged and is seated properly. Check if the fuel pump is capable of maintaining the set pressure under static (no boost) conditions. Confirm the fuel system's return path is sufficient.
Fuel leaks from fittings.
Ensure all -6AN ORB fittings are properly installed with their respective O-rings. Tighten fittings securely but avoid overtightening, which can damage the O-rings. Use appropriate thread sealant if necessary for the ORB fittings, but typically the O-ring seal is sufficient.
Boost referencing is not working (fuel pressure doesn't rise with boost).
Check the vacuum/boost reference line for leaks, kinks, or blockages. Ensure it is connected to a source that provides accurate manifold pressure reading. Verify the regulator's internal diaphragm and check valve are functioning correctly.
Pros and Cons
Pros
- Provides precise fuel pressure control for tuned engines.
- Supports high horsepower applications with its high flow capacity.
- Durable billet aluminum construction ensures longevity.
- Anodized black finish offers corrosion resistance and aesthetic appeal.
- Universal design simplifies installation across various vehicles.
- Compatible with alcohol and race fuels.
Cons
- Requires a good understanding of fuel system dynamics and boost referencing for proper setup.
- Installation may require modifications to existing fuel lines.
- Potential for over-pressurization if not adjusted correctly.
- Not a direct bolt-on for all vehicles; universal fitment necessitates adaptation.
- Higher cost compared to standard fuel pressure regulators.
Setup, Compatibility & Care Instructions
Setup:
- Installation: The regulator includes comprehensive installation instructions and fitting hardware. It features three -6AN (9/16" -18) ORB ports: two for fuel inlet and one for the fuel return line.
- Adjustment: Use the simple adjustment set screw to set your desired base fuel pressure. Turn clockwise to increase pressure, counter-clockwise to decrease.
- Gauge Port: Install a fuel pressure gauge in the integrated 1/8" NPT port to monitor pressure accurately.
- Boost Reference: Connect the boost reference port to a source of manifold vacuum/boost. The 1:1 ratio means for every 1 PSI of boost, fuel pressure will rise by 1 PSI above the set base.
Compatibility:
- Fuel Types: Compatible with gasoline, alcohol fuels (like E85), and race gas.
- Engine Types: Designed for high-performance, high-boost EFI engines.
- Fitting: Features three -6AN ORB ports for versatile plumbing.
Care:
- Cleaning: The CNC-machined billet aluminum body with an anodised finish can be cleaned with a soft, damp cloth. Avoid abrasive cleaners that could damage the finish.
- Inspection: Periodically check all fittings for leaks and ensure the adjustment screw remains secure. Inspect the fuel filter upstream for any obstructions.