The FCST-X is compatible with all Radium Engineering fuel cells. In addition to our cells, they can also be installed into any cell that meets the following criteria

• The fuel cell must have the industry standard 6"x10", 24-bolt flange opening
• The opening must be on the top face of the fuel cell (i.e. not a side face)
• The cell depth must be at least 7.7" (196mm) measured from the outer top face to the internal bottom face.

FUEL CELL CONFIGURATOR

Ordering a fuel cell complete with FCST-X, filler, vent and level sender can be complex and requires several parts to be ordered. In order to make sure you order the correct parts that work together, click the banner below to use our configurator tool. This will ask you questions step-by-step to help you get each choice and at the end will allow you to add all of the items to your cart to see pricing and make your purchase.

HISTORY OF THE FCST

Since 2010, external Radium Engineering fuel surge tanks have been an excellent way to eliminate fuel starvation that occurs in racing. To simplify plumbing and packaging, Radium Engineering introduced the first to market Fuel Cell Surge Tank (FCST) in 2013. This FCST quickly became the preferred fuel system for the competition vehicle market and professional racing. After 10 years of kaizen, the transformation brings the release of the FCST-X (Fuel Cell Surge Tank-10 Years).>

FEATURES

LEGACY FCST FEATURES

The features listed here carry over from previous fuel cell surge tanks into the FCST-X

• Merged single 10AN ORB female threaded outlet. All pumps use check valves that prevent back-flow
• One-way fill valves (355LPH each) allows fuel in, but not out, keeping the surge tank full
• Multiple fuel pump options including gerotor, reaction turbine, and brushless DC motor pumps
• Hermetically sealed high-current stainless steel electrical studs capable of handling all pumps
• Simplified servicing eliminates sealing washers and fuel cell retaining brackets
• Full CNC aluminum construction with anodized surfacing for superior corrosion resistance
• Fuel compatibility: leaded and unleaded gasoline, methanol, ethanol, E85, etc.
• Optional fuel surge tank level switch and diagnostic LED failsafe port
• Rollover vent valve protection

NEW FCST-X FEATURES

In addition to all previous FCST features, the new FCST-X rendition is packed with these innovations

• Fast lift and surge pump access (9 bolts total)
• Integrated lift handle for fuel pump servicing
• Lightweight surge tank increased from 2.2L to 2.6L
• Compatible with up to 4 brushless fuel pumps
• Up to 4 Bosch BR540 fuel pumps (DW400)
• Up to 3 Ti Automotive E5LM brushless pumps
• Up to 4 brushless Bosch pumps (DW440)
• Compatible with 16AN inlet mechanical pumps
• Easily swappable pump modules (sold separately)
• Compatible with shrouded level sensors
• Designed with less potential leak points
• Improved fluid control for quick filling
• Optimized internal fluid management
• Enhanced roll over protection
• Anti-rotation electrical terminals

HOW IT WORKS

A lift pump scavenges fuel from the bottom of the fuel cell and pumps it into the 2L surge tank. Inside the surge tank canister, up to 3 EFI fuel pumps can be used to feed high pressure fuel to the engine. As shown below, fuel cannot pass between the 3 independent filtration chambers (A, B, C). If less than 3 pumps are installed, the empty port does NOT need to blocked off.

If the lift pump starves, the volume inside the surge tank canister will keep the surge tank pumps fed and the engine supplied with fuel. The return from the fuel pressure regulator is also routed to the surge tank canister to help keep it full.

There are 3 fill valves integrated to the bottom of the surge tank. These 1-way FKM fill valves are sealed shut unless the fuel level in the cell rises above the fuel level in the surge tank. If this happens, each fill valve opens and sends 355LPH of fuel (1065LPH total) into the surge tank until fuel level reaches an equilibrium.

Excess fuel in the surge tank simply overflows back into the fuel cell. This dynamic sequence is all done inside the safety of a fuel cell.

PORTS AND FITTINGS

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

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

VENT, 8AN MALE
The "VENT" port is tapped with 1-1/16"-12 threads making it compatible with all 12AN ORB fittings. The FCST-X comes standard with 20-0934 which uses a common 8AN male outlet fitting for standard fuel filling. However, 20-0535 can be purchased separately with a 12AN male fitting for quick fill dry break systems that require a high-flow vent.

INCLUDES

• Anodized aluminum 6x10 plate
• Anodized aluminum surge tank pump hat
• Anodized aluminum lift pump hat
• Anodized aluminum service handle
• Anodized aluminum level sensor plate
• Anodized aluminum surge pump bracket
• Stainless lift pump mounts (shallow and deep)
• Lift pump and surge pump fuel filters
• Anodized aluminum 8AN roll over vent valve
• FKM refueling rollover protection seal
• FKM 6x10 24-hole sealing gasket
• 8AN ORB to 6AN male return fitting
• 10AN ORB to 8AN male pump out fitting
• 2AN ORB fuel level switch plug
• FKM 1-way fill valves (x3)
• Anodized aluminum acorn nuts
• Electrical wire ring terminals

SELECTING YOUR FCST-X

The different FCST-X part numbers are based on the brand/part of pumps that fit, and quantity of fuel pumps. When determining a fuel pump configuration, select a combination that can support the engine output. The lift pump is always matched to be the same style pump(s) found inside the fuel surge tank, with exception to the 20-1993-00 brushless Ti Automotive E5LM variation.

A FCST-X that states pump included comes pre-assembled with new fuel pumps and filters installed.

For a FCST-X that states pumps not included, fuel pumps must be sourced separately. A filter sock is only used for the lift pump as inlet filters are already supplied for the surge tank pumps. Also, there will be enough components included with this option to use up to 3 pumps in the surge tank.

20-1990-00

This FCST-X does not include fuel pumps. It can hold up to 3 surge tank pumps and 1 lift pump.

COMPATIBLE PUMPS

• Walbro GSS342
• AEM 50-1200
• Deatschwerks DW440⁽¹⁾

⁽¹⁾Use the electrical connector provided with the pumps

20-1990-01

This FCST-X is preassembled with 1 Walbro GSS342 lift pump and 1 Walbro GSS342 surge tank pump.

20-1990-02

This FCST-X is preassembled with 1 Walbro GSS342 lift pump and 2 Walbro GSS342 surge tank pumps.

20-1990-03

This FCST-X is preassembled with 1 Walbro GSS342 lift pump and 3 Walbro GSS342 surge tank pumps.

20-1991-00

This FCST-X does not include fuel pumps. It can hold up to 3 surge tank pumps and 1 lift pump.

NOTE: If using the optional fuel level switch inside the surge tank, only 2 surge tank pumps and 1 lift pump can be used.

PUMP COMPATIBILITY

• Bosch BR540⁽¹⁾
• Deatschwerks DW400⁽²⁾

⁽¹⁾Because this pump does not include a built-in check valve, multiple surge pumps must be ran together (not staged).
⁽²⁾Use the electrical connector provided with the pumps. For the lift pump, use the filter sock provided with the pump.

20-1992-00

This FCST-X does not include fuel pumps. It can hold up to 3 surge tank pumps and 1 lift pump.

COMPATIBLE PUMPS

• Walbro F90000267
• Walbro F90000274
• Walbro F90000285
• Walbro F90000295⁽¹⁾
• Protec 11928⁽²⁾
• Fuelab 49614⁽²⁾
• Deatchwerks DW810⁽²⁾

⁽¹⁾Because this pump does not include a built-in check valve, multiple surge pumps must be ran together (not staged).
⁽²⁾These pumps require purchasing the 13-1187 TRIPLE PUMP BASE, 12MM INLET BRUSHLESS PUMPS separately to fit them into the strainer.

20-1992-01

This FCST-X is preassembled with 1 Walbro F90000274 lift pump and 1 Walbro F90000274 surge tank pump.

20-1992-02

This FCST-X is preassembled with 1 Walbro F90000274 lift pump and 2 Walbro F90000274 surge tank pumps.

20-1992-03

This FCST-X is preassembled with 1 Walbro F90000274 lift pump and 3 Walbro F90000274 surge tank pumps.

20-1993-00

This FCST-X does not include fuel pumps. It can hold up to 2 surge tank pumps and 1 lift pump of the following.

SURGE PUMP COMPATIBILITY

• Ti Automotive E5LM (check valves included)⁽¹⁾

LIFT PUMP COMPATIBILITY

• Ti Automotive E5LM⁽¹⁾
• Walbro F90000267⁽²⁾
• Walbro F90000274⁽²⁾
• Walbro F90000285⁽²⁾
• Walbro F90000295⁽²⁾

⁽¹⁾This pump requires a brushless controller. These typically come standard when purchasing the pump. See Ti Automotive BKS1001.

⁽²⁾For these pumps, it is recommended to use the Radium Engineering 14-0143 filter sock.

20-1995-00

There are two 80u (micron) filters included for two 10AN (5/8') pickups. If using the provided 16AN (1') pickup, an external filter will need to be purchased.

The surge tank can be configured to use any combination of the following:

• One 10AN pickup for an inline external pump or mechanical pump
• Two 10AN pickups for an inline external pump and/or mechanical pump⁽¹⁾
• One 16AN pickup for an inline external pump or mechanical pump
• One 16AN pickup and one 10AN pickup for an inline external pump and/or mechanical pump⁽¹⁾

⁽¹⁾An electric pump can be used to prime a mechanical pump (for faster engine starting) when running 2 of the pickups.

This FCST-X does not include a fuel pump for the lift pump. One must be purchased separately.

LIFT PUMP COMPATIBILITY

• Walbro F90000267
• Walbro F90000274
• Walbro F90000285
• Walbro F90000295

WHAT ELSE IS NEEDED?

FUEL CELL
A fuel cell is NOT included with the FCST-X. The fuel cell MUST use a 6x10, 24-bolt fill plate flange. The distance from the outer top face to the internal floor must be at least 7.7" (196mm). The distance from the top of the fuel cell to the bottom of the lift pump filter (lowest point of the kit) is adjustable. However, if the fuel cell is deeper than 12.7" (323mm).

FUEL FILLER
The FCST-X fuel filler pattern uses a 3-bolt (59.5mm P.C.D.) flange. Radium Engineering has them for both direct filling and remote filling.

VENT HOSE
A hose and/or filter must be connected to the "VENT" port fitting.

SPARE DROP-IN PUMP MODULES

An FCST-X spare drop-in pump module is an additional lift and surge pump assembly for super fast pit stops. If fuel pressure issues arise, 9 bolts out and back in will get your team back on the track. Pumps are not included.

20-1996 Spare Drop-In Pump Module, Fits Walbro GSS342 AEM 50-1200 DW440

PUMP COMPATIBILITY

• Walbro GSS342
• AEM 50-1200
• Deatschwerks DW440⁽¹⁾

⁽¹⁾Use the electrical connector provided with the pumps.

20-1997 Spare Drop-In Pump Module, Fits Bosch BR540 or DW400

PUMP COMPATIBILITY

• Bosch BR540⁽¹⁾
• Deatschwerks DW400⁽²⁾

⁽¹⁾Because this pump does not include a built-in check valve, multiple surge pumps must be ran together (not staged).

⁽²⁾Use the electrical connector provided with the pumps. For the lift pump, use the filter sock provided with the pump.

20-1998 Spare Drop-In Pump Module, Fits Walbro F90000267/274/285

PUMP COMPATIBILITY

Walbro F90000267
Walbro F90000274
Walbro F90000285
Walbro F90000295⁽¹⁾

⁽¹⁾Because this pump does not include a built-in check valve, multiple surge pumps must be ran together. They can not be staged.

20-1999 Spare Drop-In Pump Module, Fits Brushless Ti Automotive E5LM

SURGE PUMP COMPATIBILITY

• Ti Automotive E5LM (check valves included)⁽¹⁾

LIFT PUMP COMPATIBILITY

• Ti Automotive E5LM⁽¹⁾
• Walbro F90000267⁽²⁾
• Walbro F90000274⁽²⁾
• Walbro F90000285⁽²⁾
• Walbro F90000295⁽²⁾

⁽¹⁾This pump requires a brushless controller. These typically come standard when purchasing the pump. See Ti Automotive BKS1001.

⁽²⁾For these pumps, it is recommended to use the Radium Engineering 14-0143 filter sock.

OPTIONAL ACCESSORIES

FUEL LEVEL SENDER
The FCST-X comes standard with a fuel level sender block-off plate. However, SAE fuel level sensors of various lengths can be purchased separately.

CHARCOAL CANISTER
A fuel vent charcoal canister can be seamlessly integrated into the vent hose.

FUEL LEVEL SWITCH / DIAGNOSTIC INDICATOR
The FCST-X comes standard with a 2AN ORB plug preinstalled in the "level switch" port. For information on adding a fuel level switch and diagnostic indicator. This little device provides a warning when the fuel level inside surge tank canister drops by 20% or more.