What is a fuel surge tank?

A fuel surge tank (FST) is designed to prevent fuel starvation to the engine 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 upgade 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. 

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.

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. 

All other pumps use the provided stainless steel mesh inlet screen for pre pump filtration shown above. As depicted below, 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 pump power connections are handled with specially designed high-current electrical studs. Necessary ring terminals and hardware are included with every surge tank.

As shown, the underside of the MPFST is suitable for uneven surfaces commonly found in the trunk of a vehicle. 

Stainless steel M6x1.0mm socket head bolts are included for custom mounting.

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 (does not come with a check valve)