Tomei Fuel Pressure Regulator Type L - Large Diaphragm (Universal)

Achieve precise fuel pressure control with the Tomei Type L Fuel Pressure Regulator. Featuring a large diaphragm design for improved response and stability, this premium regulator delivers 1:1 rising rate fuel pressure control with adjustable range from 30-80 PSI.

⚠️ IMPORTANT COMPATIBILITY NOTE: This regulator is NOT compatible with E85 ethanol fuel. For gasoline use only.

Key Features:

• Large diaphragm design for improved response and stability
• 1:1 rising rate fuel pressure control
• Adjustable fuel pressure: 30-80 PSI (2.1-5.6 kg/cm²)
• -6AN inlet and outlet ports for universal fitment
• -6AN vacuum/boost reference port
• High-quality construction for reliability
• Universal application - works with any fuel system
• Tomei quality engineering and manufacturing

Performance Benefits:

• Large Diaphragm: Better response and more stable fuel pressure control
• 1:1 Rising Rate: Fuel pressure increases proportionally with boost pressure
• Wide Adjustment Range: 30-80 PSI covers most applications
• Universal Fitment: -6AN ports work with any fuel system
• Improved Performance: Maintains proper air/fuel ratio under boost
• Reliable Operation: Tomei quality ensures consistent performance

Specifications:

• Brand: Tomei Powered
• Part Number: TB507A-0000B
• Product: Fuel Pressure Regulator Type L
• Diaphragm: Large diaphragm design
• Rising Rate: 1:1 (fuel pressure increases 1 PSI per 1 PSI of boost)
• Pressure Range: 30-80 PSI (2.1-5.6 kg/cm²)
• Inlet Port: -6AN
• Outlet Port: -6AN
• Return Port: -6AN
• Vacuum/Boost Reference: -6AN
• Fuel Compatibility: Gasoline only (NOT compatible with E85)
• Application: Universal (any fuel system)

Fitment Information:

• Universal Application: Works with any vehicle and fuel system
• Common Uses:
• Turbocharged engines requiring rising rate fuel pressure
• Supercharged engines needing boost-referenced fuel control
• High-performance naturally aspirated builds
• Aftermarket fuel system upgrades
• Standalone ECU installations
• ⚠️ IMPORTANT: NOT compatible with E85 ethanol fuel - gasoline use only
• Note: Requires -6AN fuel lines and fittings for installation

What's Included:

• Tomei Type L fuel pressure regulator
• Mounting bracket
• Installation instructions

Installation Notes:

• Professional installation recommended
• Requires -6AN fuel lines and fittings (sold separately)
• Must be installed in fuel return line
• Vacuum/boost reference line required for proper operation
• Set base fuel pressure with engine at idle (vacuum applied)
• Verify fuel pressure under boost before aggressive driving
• Use with gasoline only - NOT compatible with E85

Large Diaphragm Design:

The Type L features a large diaphragm design that provides improved response and more stable fuel pressure control compared to smaller diaphragm regulators. The larger diaphragm surface area allows for more precise control and better response to rapid changes in boost pressure, making it ideal for turbocharged and supercharged applications.

1:1 Rising Rate Fuel Pressure Control:

The Type L provides 1:1 rising rate fuel pressure control, meaning fuel pressure increases 1 PSI for every 1 PSI of boost pressure. This maintains proper fuel pressure differential across the injectors under boost, ensuring the correct air/fuel ratio is maintained. The 1:1 ratio is the most common and effective for most turbocharged applications.

Adjustable 30-80 PSI:

The wide adjustment range of 30-80 PSI (2.1-5.6 kg/cm²) covers most applications from mild street builds to aggressive race setups. The adjustment is made via the top-mounted adjustment screw, allowing you to fine-tune fuel pressure to match your injector size and fuel system requirements.

-6AN Ports for Universal Fitment:

All ports on the Type L are -6AN (AN6), which is the most common size for aftermarket fuel systems. The -6AN sizing provides excellent flow capacity while being compatible with widely available fuel lines and fittings. The regulator features inlet, outlet, return, and vacuum/boost reference ports.

E85 Incompatibility:

This fuel pressure regulator is NOT compatible with E85 ethanol fuel or other ethanol-based fuels. The internal components are designed for gasoline use only and may be damaged by the corrosive properties of ethanol-based fuels. If you are running E85 or plan to run E85 in the future, you must use an E85-compatible fuel pressure regulator. Using this regulator with E85 will void the warranty and may result in fuel system failure.

How It Works:

The fuel pressure regulator is installed in the fuel return line between the fuel rail and fuel tank. The vacuum/boost reference port is connected to the intake manifold. Under vacuum (idle/cruise), the regulator maintains base fuel pressure (typically 40-45 PSI). Under boost, the regulator increases fuel pressure proportionally (1:1 ratio) to maintain proper fuel pressure differential across the injectors.

Why Tomei?

Tomei Powered has been manufacturing high-performance parts for Japanese vehicles for over 50 years. Their fuel pressure regulators are trusted by professional tuners and racers worldwide for reliable, precise fuel pressure control. Every Tomei product is engineered and manufactured to the highest standards.

Installation Tips:

• Install in fuel return line after fuel rail
• Mount regulator with ports facing down to prevent air bubbles
• Connect vacuum/boost reference to intake manifold
• Use quality -6AN fuel lines and fittings
• Set base pressure to 40-45 PSI at idle (with vacuum applied)
• Verify 1:1 rising rate under boost with fuel pressure gauge
• Check for leaks before starting engine

Perfect For:

• Turbocharged engines requiring rising rate fuel control (gasoline only)
• Supercharged builds needing boost-referenced regulation
• Aftermarket fuel system upgrades
• Standalone ECU installations
• Anyone seeking reliable Tomei quality

Perfect For: Turbocharged and supercharged gasoline builds requiring precise 1:1 rising rate fuel pressure control with Tomei's proven large diaphragm design.

Pro Tip: Set base fuel pressure at idle with vacuum applied, then verify 1:1 rising rate under boost with a fuel pressure gauge.

⚠️ IMPORTANT: NOT compatible with E85 ethanol fuel - gasoline use only. Universal fitment with -6AN ports.

Achieve precise fuel control with Tomei Type L - large diaphragm, 1:1 rising rate, 30-80 PSI adjustable, -6AN ports, gasoline only.