FCST, Fuel Cell Surge Tank

8 175,00 kr
  • radfcst
8 175,00 kr

* Obligatoriska fält


Surge Tank Pumps and Lift Pump Not included

Click here to download installation instructions (PDF)
For installation on older 20-014X-XX FCST versions click HERE.

The Fuel Cell Surge Tank (FCST) is a fill plate replacement for popular fuel cells including Radium, ATL, FuelSafe, Pyrotect, Harmon, Jaz, etc. For a complete combo package with a Radium Engineering fuel cell go HERE. 

The FCST is designed for EFI vehicles experiencing fuel pump starvation issues while using a competition fuel cell. It is NOT a glorified trap door box. It features a true dual-chamber fuel tank utilizing a single lift pump and up to three surge tank pumps, all in a compact drop-in package.

The FCST also provides a quick and easy way to drop-in an upgraded fuel pump system for extra flow for vehicles with large power demand upgrades. Alcohol fuels such as E85, methanol, etc can be safely used. 

Integrated Surge Tank

The FCST uses the tried and true Radium Engineering fuel surge tank system preferred by professional motorsports teams worldwide. The optimized 2.2 liter canister supports 1, 2, or 3 internally mounted surge tank pumps capable of over 4000HP (Gas @ 3bar, BSFC .45).

The fuel pumps inside the surge tank provide the primary fueling to the engine. The "lift pump" mounts next to the surge tank canister and keeps the chamber filled. The volume of fuel inside the surge tank acts as a buffer always keeping the surge tank pump(s) supplied with fuel. This volume is also maintained by the "return" from the FPR. Excess fuel in the integrated surge tank bleeds out into the fuel cell without the need of expensive hoses and fittings. All of this is done inside the fuel cell with the FCST.

Below is a quick demonstration of how a basic fuel surge tank systems work.

Because all of the compatible pumps utilize an integrated check valve, the FCST merges all pumps into a simple single outlet simplifying external plumbing. The return port has a tangential entry into the FST canister creating a swirl pot. This helps eliminate unwanted air bubbles and fuel foam that can affect fuel pump and engine performance.

The FCST uses high current stainless steel wiring terminals. All internal wires are gasoline, ethanol, and methanol compliant. Furthermore, the internal tube and hoses are a special fluoroelastomer formulation that is suitable for submersion in all types of fuel.


-Radium 20-0146 Fuel Level Sensor Block-Off Kit 
-Radium 20-0155 Fuel Cell Mounting Tab Kit
-Radium 20-0435 DSV, 12AN ORB to 8AN Male, Std Fill
-Anodized Aluminum 6x10, 24-Bolt Fill Plate
-Anodized Aluminum 2.2 Liter Surge Tank Canister
-Anodized Aluminum Lift Pump Mounting Brackets
-Anodized Aluminum Surge Tank Pump Cradle   
-Anodized Aluminum 6AN ORB Return Fitting
-Anodized Aluminum 8AN ORB Feed Fitting 
-Submersible Rubber Hose and Tubing for all Pumps
-Stainless Steel Hardware and Viton O-rings
-Fill Neck Not Included (click HERE)

Selecting Fuel Pumps

The FCST is available with or without fuel pumps. Radium assumes that the lift pump and the surge tank pumps will be the same brand so the internal wiring connectors for the surge tank pumps and the lift pumps will always be the same. 

If you are going to use your own pumps or source pumps elsewhere, select the option "Surge Tank Pumps and Lift Pump Not Included" from the drop down. Note that there will be enough components included with this option to use 1, 2, or 3 surge tank pumps. Depending on the setup, some parts will simply not be used. For configurations that do not use 3 FST pumps, the provided 2AN ORB fittings plug the unused internal pump ports. 

Next, select the type of pumps that will be used so the appropriate internal wiring connectors will be included in the kit. 

If fuel pumps are needed, the FCST will come preassembled and filters will be installed on all pumps. First, select the preferred number of surge tank pumps that will be used from the pull down menu. The FCST is sold in 1, 2, or 3 surge tank pump configurations with 1 lift pump. Next, select the type of pumps that will be used.

Fittings Explained

The external fuel pump outlet port is signified by the "PUMP OUT" engraving. It is thread tapped with 7/8"-14 threads making it compatible with all 10AN ORB fittings. The FCST comes standard with a common 10AN ORB to 8AN male adapter fitting, as shown below. However, various 10AN ORB adapter fittings can be purchased separately HERE

The external "RETURN" port is used for low pressure fuel returning from the FPR. This port is tapped with 3/4"-16 threads making it compatible with all 8AN ORB fittings. The FCST comes standard with a common 8AN ORB to 6AN male adapter fitting, as shown above. However, various 8AN ORB adapter fittings can be purchased separately HERE

The external "VENT" port is tapped with 1-1/16"-12 threads making it compatible with all 12AN ORB fittings. The FCST comes standard with 20-0435 which uses a common 8AN male outlet fitting for standard fuel filling. However, 20-0462 can be purchased separately with a 12AN male fitting for quick fill dry break systems.

FCST Parts Required

A fuel cell is not included with the FCST. If you would like a fully assembled FCST in a Radium Fuel Cell, go HERE. The fuel cell MUST use a 6x10, 24-bolt fill plate flange. The fuel cell cannot be any shorter than 8 inches. The distance from the top of the fuel cell to the bottom of the lift pump filter (lowest point of the kit) is adjustable from 8-10 inches. If the fuel cell is deeper than 10 inches, purchase this Lift Pump Extension.

If you do not currently have a 6-bolt (2.18" B.C.) filler, these Radium Fill Neck options can be used for direct or remote filling.

FCST Optional Upgrades

The FCST comes standard with a fuel level sender block off plate. However, SAE fuel level senders of various lengths can be purchased separately HERE.

For the ultimate in fuel starvation protection, the lift pump can be placed into this Radium Collector Box.

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