Aeromotive 13303 X1 EFI Return Fuel Pressure Regulator 35-75PSI

Vehicle Fitment

• Universal - designed for EFI high-flow fuel systems and performance applications

Features

• Adjustable EFI return-style fuel pressure regulator
• Base pressure adjustable from ~35 PSI to ~75 PSI
• Vacuum/boost reference capability with 1:1 rising ratio
• Two ORB-08 inlet/outlet ports for secure high-pressure connections
• One ORB-08 return port for return-style fuel systems
• 1/8" NPT gauge port with plug for easy pressure monitoring
• 1/16" NPT boost port with 5/32" hose barb for boost reference line
• Compact design with mounting bracket included

Specifications

• Brand: Aeromotive
• Part Number: 13303
• Regulator Type: EFI return-style bypass regulator
• Pressure Range: Adjustable ~35-75 PSI
• Ports: Dual ORB-08 inlet/outlet; ORB-08 return
• Gauge Port: 1/8" NPT (plug included)
• Boost Port: 1/16" NPT with 5/32" hose barb
• Compatibility: Suitable with high-flow EFI pumps up to A1000

Included Components

• 1x Aeromotive 13303 X1 EFI Return Fuel Pressure Regulator
• 1x Mounting bracket
• 1x Gauge port plug

Product Description

The Aeromotive 13303 X1 EFI Return Fuel Pressure Regulator is a universal, adjustable return-style regulator engineered to control fuel pressure in high-flow electronic fuel injection systems. With an adjustable range of approximately 35 PSI to 75 PSI, this regulator supports a broad spectrum of EFI builds, from mild street applications to high-performance and forced-induction systems. The vacuum/boost reference ensures fuel pressure rises at a 1:1 ratio with boost pressure for consistent performance under load. :contentReference[oaicite:0]{index=0}

Constructed with precision CNC-machined components, the 13303 features two ORB-08 inlet and outlet ports and a dedicated ORB-08 return port for efficient return-style fuel system plumbing. A 1/8" NPT gauge port allows easy integration of a fuel pressure gauge for monitoring and tuning. The included 1/16" NPT boost port with hose barb enables connection to manifold pressure sources, enhancing responsiveness during boost changes.

Designed to handle up to approximately 150 GPH of flow with an AN-08 return line, this regulator is suitable for use with a wide variety of Aeromotive pumps, including high-flow units up to A1000. Its universal design makes it adaptable to many custom EFI setups. Note: this part is **not legal for sale or use on emission-controlled vehicles** except as a direct OEM replacement where applicable.