Radium - Fuel Pump Hanger and FHST, Late Nissan

The pre-installed adapter fittings permit direct connections for all factory fuel line variations (SAE quick connect and hose barb). No extra fuel plumbing is required if using stock fuel lines.

• The threads on the feed port are 10AN ORB (7/8"-14) female
• The threads on the return port are 8AN ORB (3/4"-16) female

If using aftermarket AN style hoses, low profile AN swivel adapter fittings will be required and are sold separately. Straight adapter fittings may also be used, but clearance with the access cover plate will not be possible. When installing aftermarket hoses, the crossover port and hose (center) does not need to be changed.

SHOP LOW PROFILE SWIVEL FITTINGS HERE

The 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.

ELECTRICAL

The custom designed anti-rotation stainless steel electrical studs easily 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 FHST add-on, described below.

Electrical hardware is included for the fuel pump(s) and sensors. Furthermore, the in-tank wiring is insulated with high quality chemically resistant ETFE.

NOTES

• Single fuel pump installations can re-use the OEM fuel pump controller wiring
• It is recommended to upgrade OEM wiring to ensure the pumps are receiving full power and operating at their full potential
• Universal fuel pump wiring kits can be found HERE. Select one for each aftermarket pump
• Depending on fuel pressure, the venturi jet pump will consume 15-45 LPH. Take this fuel loss into consideration when sizing the fuel pumps
• If it is important for fuel pressure to hold steady after the engine is shut down, install one of these CHECK VALVES somewhere in the fuel system.

This is an optional add-on for the fuel pump hanger. The corresponding fuel pupm hanger based on the fuel pumps being used is required to install this add-on. It is recommended to use a single pump hanger to feed the surge tank. The surge tank can then be equipped with one or two fuel pumps to feed the engine.

The Radium Engineering FHST (fuel hanger surge tank) add-on is the ultimate solution for fuel starvation issues. Due to the saddle-bag style OEM fuel tank and insufficient baffling in late model Nissans, fuel slosh is common when driven aggressively. Unstable pressure resulting in a lean fuel mixture can cause engine damage. A stand-alone surge tank is an excellent device for eliminating fuel starvation issues, but installation can be complex. This add-on is a fully functional fuel surge tank mounted inside the OEM tank.

Simple plug and play connections are all that is required to attach the 2 systems together. The FHST add-on utilizes most of the Radium fuel hanger parts. The surge tank can hold 1 or 2 aftermarket pumps including brushless variations. With the addition of the fuel pump in the OEM location, there could be 2-3 pumps inside the gas tank (total). Even with all of the extra fuel pumps, the FHST system is very straight forward and relatively simple to install.

No grinding, bending, or modification of the vehicle is required. The system is compatible with all alternative fuels such as E85.

What keeps the surge tank full?

The surge tank fuel pump(s) are supplied with fuel from 4 different sources:

• The high flow (low pressure) fuel pump located in the OEM location
• The fuel returning from the fuel pressure regulator (FPR)
• The fuel transfer from the integrated venturi jet pump siphon
• The 355LPH one-way fill valve on the bottom of the surge tank

ELECTRICAL

External high current fuel pump wiring is provided for installing one FHST pump (1 relay, 1 fuse, and all associated wiring and hardware). To wire in a second FHST pump, a second fuse and relay are required. Consider purchasing Radium 17-0031 DIY Wiring Kit HERE. 

NOTE: Because the fuel pump supplying the FHST (in the original pump location) will now operate at very low pressure (high flow), the OEM external fuel pump wiring will be sufficient for this "lift" pump.

This plumbing kits include everything required to plumb the fuel system between the Radium pump hanger and the fuel rail. This kit is NOT designed for the stock fuel rail.

The kit includes 8AN (1/2") feed hose that runs from the fuel pump hanger through the provided fuel filter. A 8AN 90 degree PushLok hose end is included for connecting to an 8AN male aftermarket fuel rail fitting (not included). A 6AN (3/8") fuel hose runs from the FPR (not included) to the fuel pump hanger return port. A 6AN 90 degree PushLok hose end is included for connecting to an 6AN male aftermarket FPR fitting (not included). The fuel lines run though billet aluminum fuel brake line retainers. The fuel lines clear the OEM fuel pump cover and do not require any cutting or drilling to get them past the fuel tank. The feed and/or return hose can be easily modified for installation of an in-line flex fuel sensor.

The included Radium Engineering fuel filter mounts in the stock filter location using a specifically designed Nissan bolt-on billet mount.