Because of this flexibility, it is also perfect for Radium fuel surge tanks by eliminating the need for an extra 'Y' fitting. Alternatively, plumbing a fuel pulse damper in the return line will help with oscillations created by this unwanted restriction. Buy Radium 20-0100-00 Multipump Regulator, Black Top: Pressure Regulators - FREE DELIVERY possible on eligible purchases Skip to main. It is recommended to upgrade the OEM fuel pump unit. NOTE: While this is a high flow pressure regulator, the fuel system is still at mercy with the restrictive OEM venturi jet pump. The optional pressure guage kit 20-0386 can be installed into the unused 8AN ORB port on the regulator. Also included are vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal. The kit installs in the same location as the OEM fuel pressure regulator. Interchangeable orifices allow the user to tune the regulator for any fuel pump flow. The Radium Fuel Pressure Regulator offers adjustment from 20psi-up with a 1:1 vacuum reference. This is the preferred fuel line routing by Subaru tuners trying to address stumbling issues. The Radium FPR kit replaces the factory regulator and re-routes fuel to cycle through the engine's rails before reaching the regulator and returning to the tank. ![]() ![]() Fuel is only routed to the engine when there is demand. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. It replaces the OEM fuel pressure regulator and damper assembly. Radium Engineering Fuel Pressure Regulator Kit (Green) - Subaru WRX STI 08-21ĭescriptionThis kit is designed for use in the USDM 2008-2021 Subaru WRX STi (EJ257 only).
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