Description

COMPATIBILITY

See the details below for specific compatibility information.

While surge tanks are universal and can be used in virtually any vehicle, each part is specific to the supported pumps that can be installed into them.

OVERVIEW

A fuel surge tank (FST) is designed to prevent fuel starvation on vehicles with inadequate fuel tank baffling. Fuel is supplied to the surge tank by a lift pump, which in most cases is the OEM in-tank fuel pump. The volume of fuel inside the surge tank acts as a buffer to always keep the FST pump(s) supplied with fuel, even if the lift pump starves momentarily.

This volume is maintained by the lift 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 upgrade any standard fuel system without opening the stock fuel tank. This is an excellent fueling solution for vehicles installing large demand power upgrades such as forced induction. For more information on how a fuel surge tank works, CLICK HERE.

Recently redesigned for 2024, the Radium Engineering MPFST is the perfect solution for high power vehicles experiencing fuel starvation during aggressive driving. Multiple high flowing fuel pumps can be used in the surge tank.

The outlet from the fuel pumps merge into a single outlet simplifying external plumbing. And because the compatible pumps utilize check valves, staging is permitted.

NOTE: The brushless Ti Automotive E5LM MPFST includes check valves.

20-1440 MPFST, PUMPS NOT INCLUDED, WALBRO GSS342 OR AEM 50-1200 OR DW440

This MPFST comes ready for the end user to install 1, 2, or 3 pumps.

PUMP COMPATIBILITY

Walbro GSS342
AEM 50-1200
Deatschwerks DW440

Pumps with the same outer diameter, inlet/outlet locations and sizes, and the same electrical connection may also be compatible. Reference technical drawings of those pumps from the manufacturer to compare them to the compatible pumps to determine compatibility.

NOTES

Some of these fuel pumps are available HERE
There are many other compatible pumps that use this same physical package

20-1441 MPFST, PUMPS NOT INCLUDED, BOSCH BR540 OR DW400

This MPFST comes ready for the end user to install 1, 2, or 3 pumps.

PUMP COMPATIBILITY

Deatschwerks DW440⁽²⁾
Bosch BR540⁽¹⁾⁽²⁾

NOTES

⁽¹⁾This pump does not have an internal check valve. These pumps cannot be staged if used.
⁽²⁾Because of the physical pump size, 3 pumps can NOT be installed if using the optional fuel level switch.

20-1442 MPFST, PUMPS NOT INCLUDED, WALBRO F90000267/274/285

This MPFST comes ready for the end user to install 1, 2, or 3 pumps.

PUMP COMPATIBILITY

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

NOTES

⁽¹⁾This pump does not have an internal check valve. These pumps cannot be staged if used.
⁽²⁾To use the following brushless pumps, the 13-1187 TRIPLE PUMP BASE must be purchased separately.

20-0443-00 MPFST, PUMPS NOT INCLUDED, TI AUTOMOTIVE E5LM

This MPFST comes ready for the end user to install 1 or 2 pumps.

PUMP COMPATIBILITY

Ti Automotive E5LM

NOTE: These brushless pumps are available HERE.

FUEL LEVEL SWITCH, WITH OR WITHOUT DIAGNOSTIC INDICATOR

20-0461 Fuel Level Switch, 1/8" NPT

The Multi-Pump Fuel Surge Tank comes standard with a 2AN ORB plug in the level switch port. When the plug is unscrewed, this 1/8" NPT fuel level switch can be installed from underneath.

When fuel level in the MPFST drops by 20% or more, a switched signal can illuminate the diagnostic indicator, or it be sent to a unit such as a dashboard mounted indicator or programmable ECU input for safety purposes.

The level switch is constructed of corrosion resistant stainless steel compatible with all fuel types. It includes 24" long, 20AWG flying leads. Polarity can easily be reversed by removing the E-clip and flipping the float. Apply PTFE thread sealant to the tapered 1/8" NPT threads when installing.

NOTE: The level switch is not compatible with 3 Bosch BR540 or 3 Deatschwerks DW400 pumps. These fuel pumps are too big, so only two can be installed with the switch.

PORTS AND FITTINGS

The fuel pump outlet port is 10AN ORB threaded and comes preinstalled with a 8AN male adapter fitting.
The overflow, supply and return ports are all 8AN ORB threaded and come preinstalled with 6AN male adapter fittings.

All of these fittings can be swapped out with different sizes (sold separately).

PLUMBING

It is very crucial that a surge tank be plumbed exactly as listed below. Installations must not deter from this installation or it will cause function issues and premature parts failures.

Stock tank pump outlet plumbs to the supply port on the MPFST
Stock tank return inlet plumbs to the overflow port on the MPFST
Pump outlet port on MPFST plumbs to the engine/fuel rail
Return port on MPFST plumbs to return port on fuel pressure regulator

Note: if you're installing this on a returnless car, you cannot block the overflow port. You must create a return port on your stock tank for the overflow port to plumb to. See the additional instructions PDF for details.

NEW FEATURES

In addition to all previous MPFST features, the new MPFST rendition is packed with new innovations and increased support for more fuel pumps including more of the increasingly popular brushless pumps. Some of the new features and support include:

Up to 3 Bosch BR540 fuel pumps (DW400)
Up to 2 Ti Automotive E5LM brushless pumps
Up to 3 brushless Bosch pumps (DW440)
Anti-rotation electrical terminals

When fuel enters the MPFST through the supply and return ports, it gets redirected and runs tangential through the canister creating a swirl pot. This helps eliminate unwanted air bubbles and fuel foam that can affect fuel pump and engine performance.

The pumps are mounted using an anodized aluminum bracket. All internal wires are gasoline, ethanol, and methanol compliant. The brushless Ti Automotive E5LM MPFST (shown above) utilizes a standard press-in filter sock. All other pumps use the provided stainless steel mesh inlet screen for pre pump filtration shown above. Fuel cannot pass between the 3 independent filtration chambers (A, B, C).

NOTE: If less than 3 pumps are installed, the empty port does NOT need to blocked off.

The fuel pump power connections are handled with specially designed anti-rotation high-current electrical studs. Necessary ring terminals and hardware are included with every surge tank.