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Our Price: $69.95
Regulator Top

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Click here to download installation instructions (PDF).

The universal Radium Fuel Pressure Regulator (FPR) is built around an OEM Bosch regulator top. These Bosch regulator units are the same found on millions of OEM vehicles from Porsche, Audi and VW to Ford making the quality exceptional. The extremely compact billet aluminum housing provides a convenient package for plumbing and mounting. The regulator body is held in the housing with a stainless steel snap ring and can easily be removed for cleaning or replacement using snap-ring pliers.

The Bosch regulator tops are vacuum referenced with a 1:1 ratio. As intake manifold pressure changes, the fuel pressure changes at the same rate. Or if the vacuum reference is removed a constant static fuel pressure can be achieved. The compact housing is equipped with an integrated machined -6AN male flare fitting for the bottom return port. This reduces the number of fittings required and eliminates a potential leak point. The 2 main high pressure ports are threaded for 6AN ORB. There is also a 1/8 NPT female port for a guage, pressure transducer, etc. Each regulator body is laser etched and anodized for a superior finish.

NOTE: The 3 and 4 Bar Bosch regulator tops are NOT adjustable.


-Billet 6061 Aluminum Housing 
-6AN Male Adapter Fitting
-6AN ORB Plug Fitting 
-1/8-27 NPT Port Plug 
-Integrated -6AN Male Return Port
-Stainless Steel Mounting Hardware
-Stainless Steel Snap Retaining Ring
-Anodized Aluminum Mounting Bracket


Regulator Tops:

There are aftermarket adjustable regulator tops that will snap into the Radium billet housing. Also, there are unique non adjustable Bosch variations that are available, such as 3.5 Bar. If one of these is required, select Radium 20-0014. This option includes everything needed with the exception of the regulator top, as shown below.

Radium can provide 2 different GENUINE Bosch regulator tops: 3.0 Bar (43.5 psi) static and 4.0 Bar (58.2 psi) static. NOTE: The exact min, static, and max pressures are influenced by the flow rate of the fuel pump being used. Radium FPRs are tested using a common high flowing Walbro 255lph pump. If a significantly higher flowing pump is used, the minimum pressure ratings may be higher than advertised. If installing in a ~600hp+ engine, consider a high flow fuel pressure regulator.

Fuel Pressure Gauge:

Radium also offers an optional fuel pressure gauge (shown below). This secures to the front 1/8"-27 NPT port of the fuel pressure regulator housing. 


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