WHAT IS A SURGE TANK?
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 built-in 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.

MULTI-PUMP FUEL SURGE TANK-REGULATED (MPFST-R)
The Radium Engineering MPFST-R is the perfect solution for simplifying a high power vehicle experiencing fuel starvation during aggressive driving. When compared to a typical surge tank, there is one less port fitting. Instead, the built-in regulator returns low pressure fuel directly into the surge tank negating the need for an external FPR return line. 

Furthermore, up to 3 high flowing fuel pumps (described below) can be installed in the surge tank.

PLUMBING & PORTS
All pumps feed out through the single outlet port from the integrated fuel pressure regulator. This single feed line will dead-end at the engine (no return line). This "PUMP OUTLET" port is a 10AN ORB female and comes preassembled with an adapter fitting for 8AN male. Other adapter fittings can be installed as needed (sold separately).

The 'OVERFLOW' and 'SUPPLY' ports are female 8AN ORB threaded and come preinstalled with -6AN male adapter fittings. These adapter fittings can be swapped out with different sizes (sold separately).

ELECTRICAL
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.
All internal wires are gasoline, ethanol, and methanol compliant. 

MOUNTING


Integrated mounting feet are designed to be used with M6 (or 1/4") fasteners.

BUILT-IN REGULATOR
RA-series regulators feature the first tool-less pressure adjustment. A jam nut and set screw are no longer required. With a simple turn of the knob, pressure will be increased or decreased. 

To aid in adjusting pressure, there are incremental detents that provide haptic feedback to the user. Every detent equates to about 1psi of adjustment depending on current fuel pressure. Furthermore, RA-series regulators feature a 360 degree swiveling vacuum reference port that is double O-ring sealed. This is the first in the industry. It permits the installer to quickly point the vacuum fitting in any direction with no tools required.

The built-in regulator is 1:1 vacuum reference capable. There are 4 interchangeable 10-32 threaded vacuum port fittings provided to suit different vacuum hose types. The reference port can also be plugged with the included screw for constant fuel pressure. 


The MPFST-R features an 1/8' NPT fuel pressure port at the regulator. An 1/8' plug is provided. However, a fuel pressure gauge or sensor can be installed to adjust and monitor fuel pressure.

PRODUCT OPTIONS 
Select a version of the MPFST-R that is compatible with the fuel pumps you would like to use. For more information on fuel pump types, CLICK HERE. Fuel pumps are SOLD SEPARATELY.

20-1445 MPFST-R, PUMPS NOT INCLUDED, WALBRO GSS342 OR AEM 50-1200 OR DW440
This MPFST-R comes ready for the end user to install 1, 2, or 3 pumps.

PUMP COMPATIBILITY
Walbro GSS342
AEM 50-1200
Deatschwerks DW440
NOTES:
1. There are many other compatible pumps that use this same physical package.

20-1446 MPFST-R, PUMPS NOT INCLUDED, BOSCH BR540 OR DW400
This MPFST-R comes ready for the end user to install 1, 2, or 3 pumps (sold separately).

PUMP COMPATIBILITY
Deatschwerks DW440
Bosch BR540 (does not come with a check valve)
NOTE: Because of the physical pump size, 3 pumps can NOT be installed if using the optional fuel level switch.

20-1447 MPFST-R, 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 (does not come with a check valve)

To use the following brushless pumps, the 13-1187 TRIPLE PUMP BASE, 12MM INLET BRUSHLESS PUMPS  must be purchased separately.

-Protec 11928
-Fuelab 49614
-Deatchwerks DW810

NOTES:
1. Some of these fuel pumps are available HERE.

OPTIONAL ACCESSORIES

Fuel pressure gauge (P/N 20-0029)

20-0461 Fuel Level Switch, 1/8' NPT (more information)

NOTE: The level switch is not compatible with 3 Bosch BR540 or 3 Deatchwerks DW400 pumps. These fuel pumps are too big.

20-0519 Fuel Level Switch Plus Diagnostic Indicator (more information)

NOTE: To purchase the diagnostic indicator by itself, click this link 20-0508 Fuel Level Diagnostic Indicator. But know that the 20-0461 fuel level switch is necessary for the diagnostic indicator to work.