Aeromotive 13129 Compact EFI Bypass Fuel Pressure Regulator 30-70 PSI -6AN

Vehicle Fitment

• Universal - compatible with any EFI (fuel-injected) vehicle or engine application requiring an inline return-style bypass fuel pressure regulator
• Compatible with gasoline (including leaded race fuel), E85, and diesel fuel systems
• Supports naturally aspirated and forced induction (turbo/supercharged) EFI engines up to 1,000 horsepower
• Suitable for street performance, road racing, drag racing, and high-performance street/strip EFI applications

Fitment Notes

• The 13129 is a universal inline EFI bypass regulator - it is not vehicle-specific and requires integration into the vehicle's fuel system return line. Installation requires -6 AN fuel lines for inlet, outlet, and return, plus a vacuum/boost reference hose connection.
• Fittings are NOT included. The regulator ports are ORB-06 (O-ring boss). Aeromotive PN 15606 adapts ORB-06 to AN-06 fuel line fittings. For a complete kit including the regulator, three AN-06 port fittings, and a fuel pressure gauge, see Aeromotive PN 13130.
• A 1/8-inch NPT gauge port is provided on the regulator body - requires a 1/8-inch NPT fuel pressure gauge fitting (not included). Aeromotive PN 15633 is a compatible gauge.
• The vacuum/boost reference port must be connected to the intake manifold for correct boost-referenced fuel pressure compensation on forced induction applications. On naturally aspirated applications, it can be connected to manifold vacuum or capped with the appropriate plug.
• This product is not legal for sale or use on emission-controlled vehicles except when used as a direct replacement part matching OEM specifications. Intended for performance, off-road, and competition applications.
• Service kit: Aeromotive PN 13003 (diaphragm replacement kit for this regulator).

Features

• Compact EFI Return-Style Bypass Regulator - Up to 1,000 HP: Capable of supporting EFI applications up to 1,000 horsepower, the 13129 handles the output of high-flow Aeromotive electric fuel pumps - including the Stealth 340, 450, and 525 LPH, as well as the A1000 - in a smaller, lighter package than Aeromotive's larger regulator bodies. The compact size makes it particularly suitable for installations where space is limited or where a cleaner, lower-profile fuel system layout is desired.
• 30-70 PSI Base Pressure - Fully Adjustable: Base fuel pressure (vacuum/boost disconnected) is adjustable from 30 to 70 PSI - covering the standard EFI operating range for port-injected engines (typically 40-60 PSI) as well as higher-pressure applications with modified or large-displacement injectors. Adjustment is made via the spring-loaded cap without disassembling the regulator.
• 1:1 Boost/Vacuum Reference - Precise Fuel Pressure Compensation: Fuel pressure rises at a precise 1:1 ratio with boost pressure when the vacuum/boost reference port is connected to the intake manifold. This compensates for the increased injector pressure drop under boost - maintaining consistent fuel delivery per injector pulse width across the full boost range without requiring fueling recalibration for varying boost levels.
• Three ORB-06 Ports - (2) Inlet/Outlet + (1) Return: The regulator provides two ORB-06 inlet/outlet ports and one ORB-06 return port. The dual inlet/outlet ports allow series fuel line routing through the regulator and support multiple fuel rail connections without requiring additional T-fittings or adapters in many common EFI configurations.
• CNC-Machined 6061 T6 Billet Aluminum - Bright Dip Black Anodized: The regulator body is precision machined from 6061 T6 aerospace-grade billet aluminum and finished with Aeromotive's bright dip black anodizing - providing corrosion resistance, fuel compatibility, and a clean appearance that complements billet engine bay components.
• Convoluted Diaphragm with Proprietary Elastomer: Uses Aeromotive's convoluted diaphragm design with proprietary elastomer materials - providing precision pressure control, consistent set-point accuracy, and long diaphragm service life across temperature and pressure extremes in high-performance EFI applications.
• Stainless Steel Mounting Bracket Included: A stainless steel mounting bracket is included with the regulator for chassis or firewall mounting, providing a secure, vibration-resistant installation point in a variety of under-hood locations.
• 1/8-Inch NPT Gauge Port: A dedicated 1/8-inch NPT gauge port allows installation of a fuel pressure gauge for real-time fuel pressure monitoring - useful during setup, tuning, and ongoing system monitoring.
• Rebuildable: The 13129 is rebuildable using Aeromotive PN 13003 diaphragm service kit, extending the service life of the regulator assembly rather than requiring full replacement when the diaphragm wears.
• Designed and Manufactured in the USA: Not an import or knock-off - the 13129 is designed, manufactured, assembled, and tested in the USA to Aeromotive's aerospace-derived quality standards.

Specifications

• Part Number: 13129
• Brand: Aeromotive
• Product Type: Compact EFI Return-Style Bypass Fuel Pressure Regulator
• Regulator Style: Inline bypass (return style)
• Base Pressure Range: 30-70 PSI (adjustable)
• Boost/Vacuum Reference: Yes - 1:1 ratio
• Inlet Port: (2) ORB-06 (-6 AN female O-ring)
• Outlet Port: (1) ORB-06 (-6 AN female O-ring)
• Return Port: (1) ORB-06 (-6 AN female O-ring)
• Gauge Port: 1/8-inch NPT
• Body Material: CNC-machined 6061 T6 billet aluminum
• Finish: Bright dip black anodized cap
• Mounting Bracket: Stainless steel (included)
• HP Rating: Up to 1,000 HP
• Fuel Compatibility: Gasoline, E85, Diesel
• Fittings Included: No (see PN 15606 for AN-06 fittings; PN 13130 for complete kit)
• Rebuildable: Yes (service kit: PN 13003)
• Country of Manufacture: USA
• Fitment: Universal
• Emissions: Not legal for use on emission-controlled vehicles except as direct OEM replacement
• Warranty: 1 Year
• Quantity: 1 (sold individually)

Included Components

• 1x Aeromotive 13129 Compact EFI Bypass Fuel Pressure Regulator
• 1x Stainless Steel Mounting Bracket
• Note: AN port fittings and fuel pressure gauge sold separately (see PN 15606 and 15633; or PN 13130 for complete kit)

Product Description

The Aeromotive 13129 is a compact EFI return-style bypass fuel pressure regulator designed for inline installation in high-performance EFI fuel systems - supporting applications up to 1,000 horsepower in a smaller, lighter package than Aeromotive's full-size regulator bodies. It is designed specifically for builds where fuel system cleanliness and compactness are priorities alongside performance, without sacrificing the precision and flow capacity that high-output EFI applications demand.

Base pressure is adjustable from 30 to 70 PSI with a 1:1 boost/vacuum reference ratio - maintaining precise fuel rail pressure compensation across the full boost range on turbocharged and supercharged applications. All three ports (two inlet/outlet and one return) are ORB-06 for -6 AN fuel line connections. The CNC-machined 6061 T6 billet aluminum body is finished with bright dip black anodizing and ships with a stainless steel mounting bracket. A 1/8-inch NPT gauge port is included for fuel pressure monitoring.

Fittings are not included - see Aeromotive PN 15606 for AN-06 ORB port adapters, or PN 13130 for the complete kit with three AN-06 fittings and a fuel pressure gauge. Service kit PN 13003 is available for diaphragm replacement. Designed and manufactured in the USA. Universal fitment. 1-year warranty.