VAC Motorsports - Air & Fuel Delivery for BMW Performance Builds / Fuel Surge Tanks for Hard Driving & Track Use

Radium Engineering Fuel Surge Tank, Single

Fri, 7 Oct 2022 07:51:17 GMT

Radium Engineering Fuel Surge Tank, Single
Buy Now: $399.95

A fuel surge tank (FST) is designed to prevent starvation to the engine on vehicles with inadequate fuel tank baffling. The surge tank also provides a quick and easy way to upgade any standard fuel system without the need to modify the stock fuel tank or pump. It is also an excellent fueling solution for vehicles installing large fuel demand power upgrades such as forced induction.

HOW A FST WORKS
The volume of fuel inside the surge tank acts as a buffer to always keep the FST pump supplied with fuel. This volume is maintained by the main fuel tank's pump as well as the fuel returning from the fuel pressure regulator. Excess fuel in the surge tank is returned back to the vehicle's main fuel tank.

The surge tank also provides a quick and easy way to upgade any standard fuel system without the need to modify the stock fuel tank or pump. This is an excellent fueling solution for vehicles installing large fuel demand power upgrades such as forced induction.

PLUMBING
All adapter fittings on top of the FST are 6AN (9/16"-18) male.
1. The internal FST pump directly feeds the fuel rail(s), through the green 6AN bulkhead fitting. The pump outlet fitting is available in -6AN male size only.
2. The 3 black (interchangeable) 6AN ORB fittings are used for the following.
a. Fuel entering the FST (from the lift pump)
b. Fuel overflowing and leaving the FST (to main tank)
c. Fuel returning from the fuel pressure regulator

NOTES:
1. An internal flow deflector prevents fuel foam and aeration on all 3 ports.
2. The pumps mount internally using tubing that is gasoline, ethanol, and methanol resistant.

ELECTRICAL
The stainless 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. Electrical hardware is included for the fuel pump. Furthermore, the in-tank wiring is insulated with high quality chemically resistant ETFE. Relay kits, such as 17-0031, are recommended to drive these new internal fuel pump.

PUMP COMPATIBILITY
This system supports the following fuel pumps (sold separately):

*Walbro F90000267
*Walbro F90000274
*Walbro F90000285
*Walbro F90000295
*Walbro GSS341
*Walbro GSS342
*Walbro GSS341
*AEM 50-1000
*AEM 50-1200
*AEM 50-1220
**Deatschwerks DW440 (brushless)
**Deatschwerks DW810 (brushless)
**Protec 11928 (brushless)
**Fuelab 49614 (brushless)
*Ti Automotive E5LM (brushless)

*Sock filters are provided in this kit for these pumps.
**Sock filters are included from the fuel pump manufacture.
Need help selecting a pump? More info regarding these pumps can be found HERE.

INCLUDED
-Extruded anodized aluminum 1.5 liter canister
-Removeable O-ring sealed billet aluminum caps
-6AN O-ring fittings (other sizes found HERE)
-Corrosive resistant stainless steel hardware
-Stainless clamps for 39-45mm diameter pumps
-Large and small ID pump connections
-Plug and Play pump wiring
-Pre fuel pump sock filters

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Radium Engineering Fuel Cell Surge Tank

Wed, 15 Dec 2021 11:30:36 GMT

Radium Engineering Fuel Cell Surge Tank
Buy Now: ~~$749.95~~ $749.95

BACKGROUND

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, in 2013 Radium Engineering introduced the first generation Fuel Cell Surge Tank (FCST) to the competition vehicle market. It quickly became the preferred fuel system for professional racing.

WHAT IS A FCST?

The Fuel Cell Surge Tank is a drop-in fuel pump system for Radium Engineering's popular fuel cells or any cell that uses the industry standard 6x10 24-bolt fill plate bolt pattern. The FCST is designed to protect EFI vehicles that experience fuel starvation. It is NOT a glorified trap door box with baffles. It features a true dual-chamber fuel tank utilizing a single lift pump and up to 3 surge tank pumps all packaged inside the fuel cell. It provides all the benefits of a traditional external fuel surge tank without safety concerns and plumbing complexity.

IS THIS COMPATIBLE WITH MY FUEL CELL?

To install a Radium Engineering FCST into a fuel cell, the following criteria must be met:

1. The cell must have the industry standard 6"x10" 24-bolt flange opening.

2. The opening must be on the top face of the fuel cell (i.e. not a side face).

3. The cell depth must be at least 7.7" (196mm) measured from the outer top face to the internal bottom face.

HOW IT WORKS

A lift pump scavenges fuel from the bottom of the fuel cell and pumps it into the 2 liter surge tank. Inside the surge tank canister, up to 3 EFI fuel pumps can be used to feed high pressure fuel to the engine. 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 pressure regulator is also routed to the surge tank canister to help keep it full.

There are three 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.

FEATURES FOR 20-069X-XX FCST

Over the years, Radium Engineering has continued to refine the FCST into a robust and highly functional piece of hardware.

-Merged single 10AN ORB female threaded outlet. All pumps use check valves that prevent back-flow for multi-pump applications.

-One-way fill valve located on the bottom of the canister that allows fuel in, but not out, keeping the surge tank full.

-Multiple fuel pump options including gerotor, turbine, and brushless DC motor pumps.

-Hermetically sealed high-current stainless steel electrical studs capable of handling all pumps.

-Simplified servicing features eliminating nylon 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.

-Dynamic safety vent valve with rollover protection and fuel fill shut-off.

-Optional fuel surge tank level switch and diagnostic LED failsafe port.

WHATS IN THE BOX?

The following comes standard with every FCST variation configured per part number

-8AN DSV (dynamic safety vent) valve

-6x10 24-hole FKM gasket

-6AN male return fitting (other sizes can be utilized)

-8AN male pump out fitting (other sizes can be utilized)

-Fuel level sensor block-off plate

-Fuel level switch block-off plug

-FKM 1-way fill valves

-Stainless steel mounting hardware

-Insulated anodized aluminum acorn nuts

-Electrical power wire ring terminals

-Links for compatible fillers (not included), Direct Mount or Remote Mount

SELECTING YOUR FCST

The different FCST part numbers are based on the brand and quantity of fuel pumps. When determining a fuel pump configuration, use the chart below to select a combination that can support the engine's output.

20-069X-XX FCST

The 20-069X-XX Fuel Cell Surge Tanks (with exception to brushless E5LM) are available with and without pumps included. The lift pump is always matched to be the same style pump(s) found inside the fuel surge tank canister. Any option that lists "Pump Included" comes pre-assembled with new fuel pumps and filters installed.

If "no pumps" are ordered (shown above), fuel pumps must be sourced separately. A filter sock will only be required 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. Depending on the setup, some parts may not be used.

20-0693-00 FCST, PUMPS NOT INCLUDED, BRUSHLESS TI AUTOMOTIVE E5LM

The 20-0693-00 Fuel Cell Surge Tank is only available without pumps included. It is designed to use one or two Ti Automotive E5LM brushess fuel pumps inside the surge tank. A standard brushed pump is used as a lift pump.

As shown below, the lift pump electrical and plumbing is set to be compatible with Walbro F90000267/274/285/295 fuel pumps. Radium Engineering recommends the Walbro F90000295 as a lift pump for maximum flow. Filter socks are required for all pumps.

NOTE: Ti Automotive brushless fuel pumps do not have integrated check valves like many other pumps.

So this FCST includes two 20-0598 fuel pump outlet adapter check valves (shown above). Because the 2 surge tank pumps merge into a single outlet collector, these high flow 1-way valves permit multiple pumps to be staged without backflow.

20-0695-00 FCST, PUMPS NOT INCLUDED, EXTERNAL PUMPS

The 20-0695-00 Fuel Cell Surge Tank is only available without pumps not included. It is designed to be used with a mechanical fuel pump or inline electric pump(s). One or two -10AN (5/8") fuel pickups are used inside the surge tank. Each pickup uses a 80u (micron) filter. If two pickups are used, 20-0737 Distribution Block is recommended for pumps that use a 12AN inlet.

The lift pump electrical and plumbing for this kit is set to be compatible with Walbro F90000267/274/285/295 fuel pumps. Radium Engineering recommends the Walbro F90000295 as a lift pump for maximum flow with a 14-0143 Filter Sock.

STANDARD FITTINGS

PUMP OUT -8AN MALE

The external 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 comes standard with a common 10AN ORB to 8AN male adapter fitting.

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 comes standard with a common 8AN ORB to 6AN male adapter fitting.

VENT -8AN MALE

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, 20-0535 can be purchased separately with a 12AN male fitting for quick fill dry break systems that require a high-flow vent.

WHAT ELSE IS NEEDED?

FUEL CELL

A fuel cell is not included with the FCST. The fuel cell MUST use a 6x10, 24-bolt fill plate flange. The distance from the outer top face to the internal botton face 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.

VENT HOSE

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

Click Here for installation instructions.

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Radium Engineering Fuel Hanger Surge Tank, E9X 335i

Thu, 12 Mar 2020 07:57:22 GMT

Radium Engineering Fuel Hanger Surge Tank, E9X 335i
Buy Now: ~~$599.95~~ $599.95

The Radium Engineering FHST (fuel hanger surge tank) permits 1 or 2 aftermarket pumps to supply fuel to the engine. No grinding, bending, or modification of the BMW sheet metal is required. The FHST is compatible with following BMWs:

E90 3-Series (2/2004-9/2008)
E90 3-Series LCI (7/2007-12/2011)
E91 3-Series (2/2004-8/2008)
E91 3-Series LCI (7/2007-5/2012)
E92 3-Series (5/2005-2/2010)
E92 3-Series LCI (11/2008-6/2013)
E93 3-Series (9/2005-2/2010)
E93 3-Series LCI (11/2008-10/2013)

BMW Fuel Tank
The OEM saddle bag fuel tank is quite complex. The venturi jet pump is driven by the feed line instead of the return (M3 has 2 venturi jet pumps). The post pump filter and FPR are integrated into the LH side of the tank where the FHST mounts.

Radium FHST
When these BMWs experience high lateral Gs, they inherently suffer from fuel slosh. The FHST is the best solution in preventing fuel starvation. As described below, the FHST pump(s) are supplied with fuel from 3 different sources: the OEM electric "lift" pump, the fuel pressure regulator (FPR), and the integrated 1-way valve.

Note that the BMW fuel pump is still retained but is now repurposed as a "lift" pump to fill and maintain volume in the FHST. The lift pump fills the FHST canister through a special orifice in the FHST. This keeps the required pressure for the venturi jet pump(s) to be active and deliver fuel to the lift pump. When a low demand of fuel is present, the FHST canister will overflow back into the LH side of the OEM tank. Fuel will then cycle back into the FHST through a 1-way valve integrated to the bottom of the FHST. Unlike traditional surge tanks that rely heavily on surge tank pump and lift pump flow matching, the FHST uses an extra source that negates this important relationship. No matter what is dynamically changing with the other 2 fuel sources, the high flowing 1-way valve will constantly supply fuel to the FHST canister until the LH side of the gas tank becomes extremely low. At this point, it is up to the lift pump and the FPR to supply the last few ounces of fuel to the FHST.

Integrated Fuel Pressure Regulator
Like OEM, a fuel pressure regulator (FPR) is integrated into the unit. Furthermore, if an intake manifold signal is installed, this FPR can operate at a 1:1 ratio permitting fuel pressure to proportionally increase with boost pressure. The returning low pressure fuel from the FPR is sent back into the FST canister keeping it full. A 6-hole diverter evenly disperses fuel inside the canister preventing air bubbles and foaming. Also, 2 fuel return orifices are included for fine-tuning the desired fuel pressure to the fuel pumps' flow rate.

Plumbing
To clear the OEM fuel pump cover plate, the 8AN ORB threaded feed port features a preinstalled low profile 8AN male fitting.

As shown above, sock filters are used on the fuel pump inlets. But because the FHST eliminates the OEM post pump filter, a low micron filter will need to be purchased separately. See the 20-00475-0X fuel feed kit below.

Electrical
The custom designed stainless electrical studs easily handle the high current demand that compact bulkhead connectors lack. These serviceable connections are properly sealed and impervious to all standard and exotic fuels. Nonconductive acorn nuts are provided to prevent any accidental short circuiting. Electrical hardware is included for the fuel pump(s) and OEM level sender. Furthermore, the in-tank wiring is insulated with high quality chemically resistant PTFE.

External fuel pump wiring is specific to which FHST was purchased (see below).
1. "No Pumps Included"-This kit includes 1 relay, 1 fuse, and all associated wiring and hardware to install 1 surge tank pump.
If an extra fuel pump will be installed, purchase a Radium 17-0031 DIY Wiring Kit HERE.
2. "1 Pump Included"-This kit includes 1 relay, 1 fuse, and all associated wiring and hardware to install 1 surge tank pump.
If an extra fuel pump will be installed, purchase a Radium 17-0031 DIY Wiring Kit HERE.
3. "2 Pumps Included"-This kit includes 1 relay, 1 fuse, and all associated wiring and hardware to install 1 surge tank pump.
To run the second fuel pump, another fuse and relay is required. Consider purchasing Radium 17-0031 DIY Wiring Kit HERE.

Pump Compatibility
This system is suited, but not limited, to the following fuel pumps:
Walbro F90000267 E85
Walbro F90000274 E85
Walbro F90000285 E85
Walbro GSS342 255lph
AEM 50-1200 E85

Features
-Drop-In OEM Replacement
-Permits 1 or 2 Surge Pumps
-1:1 Fuel Pressure Adjustments
-Fuel Starvation Protection
-Integrated 1-Way Fill Valve
-High Current Electrical Hardware
-Compatible with Various Pumps
-Anodized Aluminum Construction
-Gasoline and Ethanol Compliant
-Anodized Aluminum 8AN Male Outlet Fitting
-Anodized Aluminum Surge Tank Canister
-Fuel Resistant Tubing and Wiring
-Stainless Steel Hardware
-Relay(s) and Fuse(s)

Pump Configuration Selection
If supplying your own pumps, select the option "Pumps Not Included" from the menu.

Notes:
1. When purchasing "No Pumps Included", the kit will come partially assembled as shown above.
2. There will be enough components included with this option to run one or two surge tank fuel pumps.

Configurations with pumps included will come pre-assembled and ready.

OPTIONS

FUEL FEED KITS:

20-0475-0X FUEL HANGER FEED, BMW
A -8AN PTFE fuel feed line secures to the FHST outlet, as shown below. The fuel line clears the OEM fuel pump cover and all suspension related parts. No cutting or drilling is required. This kit is NOT compatible with the M3.

The PTFE hose is routed underneath the vehicle and sent to a Radium Engineering fuel filter secured to the body using OEM hardware.

From there, a SAE quick connect fitting is provided to reattach the OEM N54/N55 fuel line.

Depending on the kit selected (-01,-03,-05), the fuel filter will be assembled with 1 of 3 different elements. Go HERE for more filter element information.

INCLUDES
-Fuel Filter (-01 Cellulose, -03 Stainless, or -05 Microglass)
-Fuel Filter Billet Clamp
-BMW Fuel Filter Mount
-Black Adapter Fittings
-Stainless Steel Hardware

Click Here for installation instructions.

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Radium Engineering Fuel Hanger Surge Tank, E9X M3

Thu, 12 Mar 2020 06:47:02 GMT

Radium Engineering Fuel Hanger Surge Tank, E9X M3
Buy Now: ~~$599.95~~ $599.95

Click here to download installation instructions (PDF)

The Radium Engineering FHST (fuel hanger surge tank) is compatible with all BMW E90/92/93 3-series with the N54 or N55 engine.

NOTE: This system is compatible with the E90/92/93 M3 fuel tank, however the stock M3 fuel pump cannot be controlled with the factory fuel pump controller, advanced system modifications are required to overcome this issue. This is not covered in the installation instructions and is up to the installer to devise a solution. The Fuel Feed Kit is NOT compatible with the M3.

Overview
The Radium Fuel Hanger Surge Tank is a revolutionary way to eliminate fuel starvation that can occur during high performance driving, while also providing a way to upgrade the fuel pumps for high-horsepower engine modifications. This system installs inside the BMW fuel tank on the opposite side of the factory fuel pump and can hold one or two high-flow aftermarket fuel pumps. The stock fuel pump is used to pump fuel into the FHST, while the pumps inside the FHST then supply fuel to the engine. The system is E85 compatible and does not require any permanent modifications for installation.
Read below to see how the FHST works.

BMW Fuel Tank
The OEM saddle bag fuel tank is quite complex. The venturi jet pump is driven by the feed line instead of the return (M3 has 2 venturi jet pumps). The post pump filter and FPR are integrated into the LH side of the tank where the FHST mounts.

Radium FHST
When these BMWs experience high lateral Gs, they inherently suffer from fuel slosh. The FHST is the best solution in preventing fuel starvation. As described below, the FHST pump(s) are supplied with fuel from 3 different sources: the OEM electric "lift" pump, the fuel pressure regulator (FPR), and the integrated 1-way valve.

Note that the BMW fuel pump is still retained but is now repurposed as a "lift" pump to fill and maintain volume in the FHST. The lift pump fills the FHST canister through a special orifice in the FHST. This keeps the required pressure for the venturi jet pump(s) to be active and deliver fuel to the lift pump. When a low demand of fuel is present, the FHST canister will overflow back into the LH side of the OEM tank. Fuel will then cycle back into the FHST through a 1-way valve integrated to the bottom of the FHST. Unlike traditional surge tanks that rely heavily on surge tank pump and lift pump flow matching, the FHST uses an extra source that negates this important relationship. No matter what is dynamically changing with the other 2 fuel sources, the high flowing 1-way valve will constantly supply fuel to the FHST canister until the LH side of the gas tank becomes extremely low. At this point, it is up to the lift pump and the FPR to supply the last few ounces of fuel to the FHST.

Integrated Fuel Pressure Regulator
Like OEM, a fuel pressure regulator (FPR) is integrated into the unit. Furthermore, if an intake manifold signal is installed, this FPR can operate at a 1:1 ratio permitting fuel pressure to proportionally increase with boost pressure. The returning low pressure fuel from the FPR is sent back into the FST canister keeping it full. A 6-hole diverter evenly disperses fuel inside the canister preventing air bubbles and foaming. Also, 2 fuel return orifices are included for fine-tuning the desired fuel pressure to the fuel pumps' flow rate.

Plumbing
To clear the OEM fuel pump cover plate, the 8AN ORB threaded feed port features a preinstalled low profile 8AN male fitting.

As shown above, sock filters are used on the fuel pump inlets. But because the FHST eliminates the OEM post pump filter, a low micron filter will need to be purchased separately. See the 20-00475-0X fuel feed kit below.

Electrical
The custom designed stainless electrical studs easily handle the high current demand that compact bulkhead connectors lack. These serviceable connections are properly sealed and impervious to all standard and exotic fuels. Nonconductive acorn nuts are provided to prevent any accidental short circuiting. Electrical hardware is included for the fuel pump(s) and OEM level sender. Furthermore, the in-tank wiring is insulated with high quality chemically resistant ETFE.

These kits include 1 relay, 1 fuse, and all associated wiring and hardware to install 1 surge tank pump.
If an extra fuel pump will be installed, purchase a Radium 17-0031 DIY Wiring Kit HERE.

Pump Compatibility
This system is suited, but not limited, to the following fuel pumps:
Walbro F90000267
Walbro F90000274
Walbro F90000285
Walbro GSS342 255lph
AEM 50-1200

Features
-Drop-In OEM Replacement
-Permits 1 or 2 Surge Pumps
-1:1 Fuel Pressure Adjustments
-Fuel Starvation Protection
-Integrated 1-Way Fill Valve
-High Current Electrical Hardware
-Compatible with Various Pumps
-Anodized Aluminum Construction
-Gasoline and Ethanol Compliant
-Anodized Aluminum 8AN Male Outlet Fitting
-Anodized Aluminum Surge Tank Canister
-Fuel Resistant Tubing and Wiring
-Stainless Steel Hardware
-Relay(s) and Fuse(s)

Pump Configuration
The kit will come partially assembled as shown above. There will be enough components included with this option to run one or two surge tank fuel pumps.

OPTIONS

FUEL FEED KITS:

20-0475-0X FUEL HANGER FEED, BMW
A -8AN PTFE fuel feed line secures to the FHST outlet, as shown below. The fuel line clears the OEM fuel pump cover and all suspension related parts. No cutting or drilling is required. This kit is NOT compatible with the M3.

The PTFE hose is routed underneath the vehicle and sent to a Radium Engineering fuel filter secured to the body using OEM hardware.

From there, a SAE quick connect fitting is provided to reattach the OEM N54/N55 fuel line.

Depending on the kit selected (-03,-05), the fuel filter will be assembled with 1 of 2 different elements. Go HERE for more filter element information.

INCLUDES
-Fuel Filter (-01 Cellulose, -03 Stainless, or -05 Microglass)
-Fuel Filter Billet Clamp
-BMW Fuel Filter Mount
-Black Adapter Fittings
-Stainless Steel Hardware

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Radium Engineering Fuel Surge Tank Install Kit, BMW E46

Wed, 11 Mar 2020 12:46:30 GMT

Radium Engineering Fuel Surge Tank Install Kit, BMW E46
Buy Now: ~~$569.95~~ $569.95

This comprehensive installation kit includes everything needed to install a Radium fuel surge tank with a single 39mm fuel pump in a 1999-2006 BMW E46 M3 or Non-M, excluding all convertibles. The base price is for installation kit only. The fuel surge tank (FST) is sold separately or select a surge tank from the options above.

Note: This kit was not designed to work with the Radium MPFST. The kit was also not designed to be used with a Radium FST-R, but it can be accomplished with a few extra steps (not described in manual).

Here is a informative video on how a Radium Fuel Surge Tank works:

The BMW install kit locates the FST in a collision-safe area of the trunk behind the rear seat. The bolt-on aluminum mounting bracket features rubber isolating grommets to reduce fuel pump noise. Also included is a fully assembled plug and play wiring harness featuring a weatherproof fuse and relay to drive the FST's fuel pump. A Delphi weatherpak connector is also provided for the fuel pump trigger activation to make the entire system modular.

Included are 8 PTFE hoses which are cut to length and preassembled. Supplied in -6AN size only.

The PTFE hoses mate at a junction point in the trunk using 4 bulkheads fittings and a billet aluminum plate for interior aesthetics.

BMW Install Kit Features:

-Preassembled 3/8" PTFE Hoses
-Aluminum Mounting Bracket with Vibration Isolators
-AN Bulkhead and Adapter Fittings
-Stainless Steel Hardware
-Complete Wiring Harness with Relay and Fuse
-Anodized Billet Aluminum Bulkhead Plate

Click Here for installation instructions.

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