Project Nissan Skyline R33 GT-R – Part 5: New Fuel System by Radium, DeatschWerks, and AEM!
Radium Engineering’s Direct Mount Regulator (DRM) is a compact high performance adjustable EFI fuel pressure regulator designed with its versatile mounting system. It can be mounted directly to a compatible fuel rail port using the included 360 degree swiveling adapter, or mounted remotely away from the fuel rail. The E85-compatible unit is compact, and fits in areas with limited space without sacrificing its 1200 LPH-capable performance.
The Radium Engineering high flow fuel filter has a 3-piece body that is CNC machined from 6061 aluminum and Type-II anodized for maximum corrosion resistance. Both removable end caps feature large -10AN female threaded ports for most power demands. I chose its optional 10-micron stainless filter element.
For easier installation Radium has a plumbing kit which has anodized metal retainers, fittings, 360-degree swivel adapters, and vaporshield lines, and all of which is E85 compatible.
MKC’s Ross Randolph was again designated Project R33 GT-R’s fuel system man. Here’s he’s seen working with the vaporshield lines from Radium.
At some point, 26-year-old RB26DETT fuel system parts just have to go. It’s a nice feeling when you know your car will be equipped with a full new fuel system.
Here’s a close up of the Radium fuel hanger, which really is a work of art. According to Radium, the RB26DETT’s OEM system uses a venturi jet pump to transfer fuel from the passive side of the tank to the active (pump) side of the tank. When using aftermarket high-flow pumps this venturi jet pump creates a restriction in the fuel return, resulting in unwanted backpressure and unmanageable fuel pressure. Radium Engineering has redesigned the siphon system to completely eliminate this restriction but still effectively scavenge fuel the same as factory. The custom designed stainless steel electrical studs handle the high current demand that compact multi-pin bulkhead connectors lack. These serviceable connections are hermetically sealed and impervious to all standard and exotic fuels. Non-conductive anodized aluminum acorn nuts are provided to prevent any accidental short circuiting. Enough studs are built in the top hat to accommodate brushless fuel pumps as well as the optional Radium fuel hanger surge tank add-on, if desired.

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