Radium Fuel Pump Hanger Surge Tank Addon (Late Nissan)

SKU: 20-0700, 20-0701 Categories: ,



  • Simple Integration into Fuel Hanger
  • Fuel Starvation Protection
  • Anodized Aluminum Construction
  • Permits 1 or 2 Surge Pumps
  • Brushless Fuel Pump Compatibility
  • High Current Electrical Hardware
  • Gasoline, Methanol, and Ethanol Compliant
  • Stainless Steel Hardware and Clamps


This product is to be used with the Late Nissan Fuel pump Hanger (20-063x-0x). 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. As shown above, simple plug and play connections are all that is required to attach the 2 systems together.

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. Furthermore, 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:
1. The high flow (low pressure) fuel pump located in the OEM location.
2. The fuel returning from the fuel pressure regulator (FPR).
3. The fuel transfer from the integrated venturi jet pump siphon.
4. The 355LPH one-way fill valve on the bottom of the surge tank.

Both brushed and brushless fuel pumps are compatible with the FHST Add-On. Fuel pumps are not provided but can be purchased separate. See the photo above for compatibility.

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. There are 2 different FHST kits available. Each is specific to the fuel pump model to be installed. (20-0700 above/20-0701 below).

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.


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Confirmed Fitment

Year Make Model
Year Make Model
1994 - 1998 Nissan Silvia S14
1994 Nissan Skyline GTS-T
1994 - 2001 Nissan Skyline GTS25-T
1998 - 2002 Nissan Skyline 25GT
1999 - 2002 Nissan Silvia S15

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