Aeromotive 13301 Universal Bypass Fuel Pressure Regulator 3-65 PSI 3/8 NPT

Vehicle Fitment

• Universal Fit - compatible with any EFI or carbureted fuel system requiring a bypass-style fuel pressure regulator with a 100-250 GPH fuel pump

Fitment Notes

• Universal fitment - not vehicle-specific. Customer must verify port sizing, return line routing, and pump GPH compatibility prior to installation.
• Bypass design requires a return fuel line from the bottom return port back to the top of the fuel tank - a deadhead (non-return) system will not work with this regulator.
• Compatible with fuel pumps rated between 100 and 250 GPH. Not recommended for pumps outside this range.
• Low pressure spring (3-20 PSI) is factory-installed for carbureted or low-pressure EFI use. High pressure spring (20-65 PSI) is included for EFI applications and must be swapped in during installation.
• Fuel compatibility: gasoline, ethanol, alcohol, and diesel.
• Vacuum/boost reference port provides 1:1 fuel pressure rise with boost - ideal for forced induction applications.
• Not legal for sale or use on emissions-controlled vehicles.

Features

• Dual-purpose bypass regulator - suitable for EFI and carbureted applications on street and strip builds
• Adjustable base pressure: 3-20 PSI with installed low-pressure spring or 20-65 PSI with included high-pressure spring
• 1:1 boost-referenced fuel pressure rise for consistent fuel delivery under forced induction
• Capable of regulating fuel pumps between 100 and 250 GPH - covers the majority of performance pump applications
• Four 3/8" NPT main body ports (1 inlet, 3 outlet) for flexible plumbing configurations
• Dedicated 3/8" NPT bypass return port on the bottom of the regulator body
• Bypass design provides dynamic, rock-steady fuel pressure control under all operating conditions
• Red anodized billet aluminum body for corrosion resistance and race-ready appearance

Specifications

• Pressure Range (Low Spring, installed): 3-20 PSI
• Pressure Range (High Spring, included): 20-65 PSI
• Max Pump Flow Rate: 250 GPH
• Inlet Ports: 1x 3/8" NPT (main body)
• Outlet Ports: 3x 3/8" NPT (main body)
• Bypass/Return Port: 1x 3/8" NPT (bottom of regulator)
• Boost Reference: 1:1 ratio vacuum/boost port
• Fuel Compatibility: Gasoline, Ethanol, Alcohol, Diesel
• Regulator Style: Bypass (return line required)
• Body Material: Billet Aluminum - Red Anodized

Included Components

• 1x Aeromotive Universal Bypass Fuel Pressure Regulator (13301)
• 1x Low Pressure Spring (3-20 PSI, factory installed)
• 1x High Pressure Spring (20-65 PSI)
• 1x Mounting Bracket with Hardware

Product Description

The Aeromotive 13301 is a dual-purpose universal bypass fuel pressure regulator designed for both EFI and carbureted applications on street and strip builds. Adjustable from 3 to 65 PSI across two included springs, it accommodates a wide range of fuel system configurations - from low-pressure carbureted setups to high-pressure EFI systems running forced induction. Its bypass design actively returns excess fuel to the tank, delivering consistently stable fuel pressure under all engine loads and demand conditions.

The 13301 features four 3/8" NPT ports on the main body (one inlet, three outlets) and a dedicated 3/8" NPT bypass return port on the bottom, providing flexible plumbing options for custom fuel system layouts. The integrated vacuum/boost reference port allows fuel pressure to rise at a 1:1 ratio with boost pressure, ensuring injectors always see the correct differential pressure under boost. Compatible with gasoline, ethanol, alcohol, and diesel fuels, this regulator pairs with any fuel pump rated between 100 and 250 GPH and is a common pairing with Aeromotive's A1000, Eliminator, and Phantom pump series.