The Radium Engineering FHST (fuel hanger surge tank) is the ultimate solution for fuel starvation issues. 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, but installation can be complex. The FHST is a fully functional fuel surge tank mounted inside the OEM tank. It can be configured with 1, 2, or 3 high pressure pumps and 1 lift pump to meet the fuel demands of any power level.

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.

FUEL SURGE TANK

What keeps the surge tank full? The FST pump(s) are supplied with fuel from 3 different sources: the high flow (low pressure) lift pump, the fuel pressure regulator (FPR) return, and the two integrated 1-way fill valves.

1. A stainless steel collector box is provided that secures to the fuel tank floor. The sensors and lift pump attach to this box assembly. The collector box features a 1-way trap door to control slosh and prevent lift pump starvation. The lift pump sends fuel into the lower portion of the surge tank. Intricate machining is used to keep fuel moving tangentially into the surge tank. This laminar flow prevents foaming and aeration.

2. The returning fuel from the FPR also fills the surge tank. This returning fuel is routed through a diverging deflector to prevent foaming and aeration.

3. Lastly there are two 1-way fill valves integrated into the lower portion of the surge tank. They allow fuel in, but not out. They supply 355LPH each (710LPH total).

PLUMBING

The preinstalled barb fittings permit direct connections to the factory fuel hoses. No extra fuel plumbing is required.

Additionally, 8AN (feed) and 6AN (return) adapter fittings are provided for connecting aftermarket -AN style hoses. The fitting ports are machined low enough to clear the unibody sheet metal.

FUEL PUMP INFORMATION

All kits come partially assembled with the final assembly performed by the technician during installation. There will have enough parts to run 1, 2, or 3 surge tank pumps and 1 lift pump. The user must supply their own compatible fuel pumps. Refer to the instructions for more details.

This system supports the following fuel pumps:

• Walbro F90000267 E85
• Walbro F90000274 E85
• Walbro F90000285 E85
• Walbro GSS342 255lph
• AEM 50-1200 E85
• Ti BKS1001 E5LM (brushless)