![]() ![]() Two 6AN fuel hoses are provided to mate each side of the fuel tank units together. The system provides all necessary adapter fittings to reconnect the OEM fuel feed line. The "IN" fitting incorporates a unique component that is required for the venturi system to work properly. While the pump "OUT" fitting can always be changed (if necessary), the FHST "IN" fitting cannot be changed. To clear the OEM LH cover plate, the 8AN ORB threaded feed port and 6AN ORB threaded inlet port feature pre-installed low profile 6AN male fittings. The 6AN ORB threaded FPR port is plugged and is only to be used if 20-0806 is purchased. NOTE: The Radium integrated regulator should be the only FPR in the fuel system. Refer to the installation instructions link above for more details. Also, 2 fuel return orifices are included for fine-tuning the desired fuel pressure to the fuel pumps' flow rate and potential hose plumbing restrictions. The returning low pressure fuel from the FPR is sent back into the FST collector box keeping it full. Conversely, the vacuum port can remain open to atmosphere and pressure will remain constant (like OEM). If an intake manifold vacuum hose is connected, the FHST's built-in fuel pressure regulator will operate at a 1:1 ratio permitting fuel pressure to proportionally increase with manifold (boost) pressure. The difference is the regulator is externally mounted with an adjustment screw and a vacuum port. Like the OEM setup, a fuel pressure regulator (FPR) is integrated into the Radium FHST. Starvation will NOT prematurely occur, but the fuel level gauge will not read accurately.īecause the Nissan fuel system is "returnless", forced induction tuning can be problematic when a 1:1 fuel to boost pressure ratio is not possible. Do NOT modify the OEM FPR or OEM venturi jet pump.Ĥ. The OEM fuel module must be upgraded to a pump with at least 340LPH 40psi) rated flow in order for the venturi system to work correctly.ģ. As described below, the FHST pump(s) are supplied with fuel from 3 different sources: the pump in the OEM fuel module, the integrated fuel pressure regulator return, and 355LPH one-way fill valves on the bottom of the collector box that allows fuel in, but not out.ġ. The OEM venturi system must be used with the Radium FHST.Ģ. The FHST pump(s) are used to supply fuel to the engine through an integrated fuel pressure regulator. The OEM venturi jet pumps will still function as designed scavenging fuel from the bottom of the tank. The OEM fuel module receives an upgraded fuel pump which is used to send fuel to the Radium FHST keeping the collector box filled. It installs in the opposite side of the fuel tank from the OEM fuel module and works together to keep fuel delivery consistent in all conditions. The Radium FHST is the best solution in preventing fuel starvation. However, the OEM fuel module still suffers from slosh resulting in an interruption of the engine's fuel supply. The OEM fuel module contains the pump, fuel pressure regulator, filter and has 2 venturi jet pumps that supply fuel from both sides of the tank. Gasoline, Methanol, and Ethanol Compliant Integrated 1:1 Adjustable Fuel Pressure Regulator ![]() Furthermore, the system is compatible with alternative fuels such as E85. No grinding, bending, or modification of the vehicle's sheet metal is required. The Radium FHST can be used with 1 or 2 aftermarket pumps and supplies 1:1 regulated fuel to the engine. So Radium Engineering chose to create a fully functional fuel surge tank INSIDE the OEM tank. But installing a stand-alone FST is difficult specifically in the 350Z due to the open-cabin design, and lack of a firewall between the driver and the rear of the vehicle. A stand-alone surge tank is an excellent device for eliminating fuel starvation issues. This results in unstable fuel pressure and possible engine damage from running too lean. Due to the saddle-bag style OEM fuel tank and insufficient baffling, fuel starvation is common when the vehicle is driven aggressively, such as on a track. The Radium Engineering FHST (fuel hanger surge tank) is the ultimate solution for fuel starvation issues in the Nissan Z33/V35 chassis. **REQUIRES 20-0896 Fuel Level Adapter, Skyline G37 Q50 Q60 (described below) *REQUIRES 20-0596 Early Model Fuel Level Adapter, 350Z G35 (described below) ![]()
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