Radium Fuel Pressure Regulator/Damper [Green]

Two parts in one! The Radium Engineering Fuel Pressure Regulator Damper (FPR-D) is the ultimate solution for consolidating critical fuel system components into a single high-flow package. It is a fully functional high performance adjustable fuel pressure regulator with a unique built-in fuel pulse damper. This universal product can be used with any EFI fuel system.

A fuel pulse damper is an excellent tool for smoothing out "noisy" fuel systems that are experiencing a lot of pulsing from the injectors opening/closing, and also from the fuel pump.

The regulator features two M6x1mm threaded mounting holes in the body. An anodized aluminum mounting plate is provided with 4 countersunk M6x1mm bolts/nuts.  The regulator can be mounted any direction, including upside down.

The inlet (side) and outlet (bottom) feature large 10AN ORB (7/8"-14) threaded ports. Two 6AN and two 8AN male adapter fittings are included to suit most aftermarket fuel systems.

The 1/8" NPT auxiliary port can be used for monitoring fuel pressure. The Radium fuel pressure gauge is commonly used. An included plug can be used if this port is not needed.

The integrated fuel pulse damper stabilizes fuel pressure from pulses created by the fuel pump, fuel injectors, regulator, etc. The base pressure requirement for maximum damping efficiency is 40-105psi (2.8-7.2bar). This range is base static pressure only, but covers the range of almost any typically fuel system. For dynamic fuel pressure outside this range, the vacuum/boost reference line will be required for the damper portion, otherwise this vacuum reference is usually plugged.

With years of track and bench testing data, the Radium Engineering regulators have been refined to optimize pressure management. A newly designed single stainless steel return orifice generates laminar flow that enhances stability control.  Fuel pressure is adjusted using the knob on the top of the regulator body.  Base pressure is measured with the fuel pump running without a vacuum line connected to the regulator.

Minimum Pressure: 18.5psi (1.3bar)
Maximum Pressure: 100+ psi (This is rhetorical. The maximum pressure is dependent on the relief valve inside the pump or the maximum current the fuel pump controller allows).

The regulator has a 360-degree swiveling vacuum reference port that is double O-ring sealed. This is the first in the industry. It permits the installer to quickly point the vacuum fitting in any direction with no tools required. 

There are 4 interchangeable 10-32 threaded vacuum port fittings provided to cover all scenarios.

• Barbed Fitting: A black zinc-plated 3/16' (5mm) barb machined from high strength steel that is compatible with the following vacuum hoses: 5/32"' (4mm), 3/16" (5mm), and 7/32" (6mm)
• 3AN Male Fitting: A black zinc-plated adapter machined from high strength steel that is compatible with 3AN hose ends
• Push-To-Connect: A nickel-plated brass fitting with Buna-N O-rings that is compatible with hard plastic 1/4' OD tubing
• Vacuum Plug: A black oxide stainless steel screw that is used to maintain a constant (non dynamic) fuel pressure. Beginning in the mid 1990s, vehicle manufacturers started transitioning to returnless fuel systems to lower EVAP emissions. To keep temperatures lower, these regulators are mounted inside the tank and do NOT have the ability to be vacuum referenced. This plug would be required in this scenario.

Included in kit:

• Main Rotating Assembly with Damper
• Mounting Bracket with M6x1mm Hardware
• 5mm Barbed Vacuum Fitting (x2)
• Vacuum Plug Fitting, Returnless (x2)
• 1/4' Push-To-Connect Fitting (x2)
• 3AN Male Vacuum Fitting (x2)
• 6AN male Adapter (x2)
• 8AN male Adapter (x2)
• 1/8' NPT Port Plug
• Vacuum Hose Y-adapter
• Vacuum Hose, 5/32' ID