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Our Price: $69.95
Regulator Top

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Click here to download installation instructions (PDF).

**This product is not recommended for fuel pumps with more than 255 LPH (at 3 Bar) rated flow**

This universal Radium Fuel Pressure Regulator (FPR) is built around the common OEM Bosch regulator tops found in many Audi/VW (and other) applications. The 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. The two main high pressure ports are threaded for 6AN ORB. There is also a 1/8 NPT female port for a gauge, pressure transducer, etc. Each regulator body is laser etched and anodized for a superior finish.

Radium offers two 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. These FPRs are tested using a common Walbro 255lph pump. If a higher flowing pump is used, the minimum pressure ratings may be higher than advertised. For applications with more pump flow, consider a high flow fuel pressure regulator.

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



If a regulator top is not needed (already have one from another source), select Radium 20-0014. This option includes everything needed with the exception of the regulator top, as shown below.

20-0010-00 and 20-0010-01:
These come assembled with the Bosch regulator unit installed in the housing, as shown below.

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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