PRODUCT DETAILS
Radium Engineering Universal Multi-Pump Fuel Surge Tank
So you've thrown a turbo on or you've built the car up and now it's hungry for fuel, and your stock tank just can't keep up. You're cornering hard or you're hammering it down a straight and the car stumbles, leans out, or flat cuts on you. That's fuel starvation, and it's not just frustrating, it'll lean you out and torch your engine if you let it keep happening. Here's the deal. Your factory tank doesn't have enough baffling to keep the pickup buried in fuel when everything's sloshing around, so your pump gulps air for a split second and your pressure drops right when you're asking the most of it. That's where Radium Engineering's Multi-Pump Fuel Surge Tank comes in. It's a second tank that stays full of fuel no matter what, so your main pumps never go dry no matter how the fuel in your main tank is moving around. And here's the part that sets this one apart, you can run 1, 2, or even 3 high-flow pumps in it, so it grows right along with whatever your build throws at it. Radium redid the whole thing for 2024 too, with more pump support, better air separation, and they finally opened it up for the brushless pumps everybody's switching to.
Here's How It Actually Keeps You From Starving
Once you see how it works it just clicks. Your factory in-tank pump becomes what's called a lift pump, and its only job now is keeping the surge tank topped off. The surge tank's holding a chunk of fuel that acts as a buffer, so even when that lift pump starves for a second mid-corner, the high-flow pumps sitting inside the surge tank are still swimming in fuel. They don't see air. Ever. That fuel level's kept full by the lift pump and by what's coming back from your fuel pressure regulator, and whatever's left over just heads back to your main tank. So your main pumps always have fuel to pull, your pressure holds steady, and your engine gets exactly what it's calling for even when you're driving the wheels off the thing. And honestly, the best part is you're doing all this without ever cracking open your stock tank, which is exactly what you want when you're throwing forced induction at the car.
Run 1, 2, Or 3 Pumps - It Grows With You
This is the whole reason people love the MPFST. You're not boxed into one pump and stuck. Run a single pump if that's all your power needs right now, then add a second or third later when you turn things up. Doesn't matter how many you run, Radium merged all the pump outlets into one single outlet, so even with three pumps crammed in there your plumbing outside the tank stays dead simple. One line out to the engine and you're done. And since the compatible pumps use check valves you can stage them, which means your extra pumps only wake up when you actually need the flow. You're not sitting there at a cruise burning fuel and making heat with all three running for no reason. They come on when the demand shows up and they back off when it doesn't.
Four Variants - Grab The One That Matches Your Pumps
The MPFST comes in four flavors depending on which pumps you're running. Every one of them comes with all the hardware you need to drop the pumps into the tank, but you're buying the pumps separately. Figure out which pumps your build's running and grab the matching version.
20-1440 takes 1, 2, or 3 of the Walbro GSS342, AEM 50-1200, or Deatschwerks DW440. This is your classic high-flow brushed pump setup, and if you've got another pump that's the same physical size it'll probably drop right in too.
20-1441 takes 1, 2, or 3 of the Deatschwerks DW400 or Bosch BR540. Couple things you've gotta know here. The Bosch BR540 doesn't have an internal check valve, so you can't stage those. And these pumps are physically chunkier, so you can't squeeze 3 of them in if you're also running the optional fuel level switch.
20-1442 takes 1, 2, or 3 of the Walbro F90000267/274/285/295, Protec 11928, Fuelab 49614, or Deatschwerks DW810. Heads up, the Walbro F90000295 has no internal check valve so it can't be staged, and the brushless ones (Protec, Fuelab, DW810) need Radium's separate 13-1187 triple pump base.
20-0443-00 is the brushless E5LM version and it plays by its own rules. It runs 1 or 2 Ti Automotive E5LM pumps only, that's the Ti BKS1001 or the Injector Dynamics BPC100. Radium throws in check valve adapters for each pump so you can stage them when you're running two. Just know the E5LM needs a brushless pump controller, which comes bundled in a bunch of different kits out there.
Plumb It Exactly Like Radium Says - Don't Freelance This
Pay attention here, because if you get this wrong you're looking at function problems and parts failing way before they should. A surge tank's gotta be plumbed exactly the way Radium lays it out, no winging it. Your stock tank pump outlet goes to the supply port on the MPFST. Your stock tank return inlet goes to the overflow port. The pump outlet port on the MPFST runs out to your engine and fuel rail. And the return port on the MPFST runs to the return port on your fuel pressure regulator. Follow that to the letter. One more big one, if you're on a returnless car you can't just cap off the overflow port. You've gotta create a return into your stock tank for that overflow to feed into. Radium's got an additional instructions PDF that walks you through it, so do yourself a favor and read it before you turn a single wrench.
What Radium Changed For 2024
This redesign isn't just a new sticker. Now when fuel comes in through the supply and return ports, Radium routes it to run tangential through the canister, so it spins up into a swirl pot. That swirl throws out the air bubbles and fuel foam that screw with how your pumps and engine run, so what's feeding your pumps is clean, solid fuel. They also blew the doors open on pump support, up to 3 Bosch BR540 or brushless DW440 pumps, and up to 2 Ti Automotive E5LM brushless pumps, which is right where the high-end builds are going these days. Radium added anti-rotation high-current electrical studs too, so your power connections stay locked down and won't spin loose on you. The pumps bolt to an anodized aluminum bracket, and every internal wire is gas, ethanol, and methanol compliant, so you're covered running pump gas, E85, or straight methanol.
Fittings And Filtration
The fuel pump outlet port's 10AN ORB threaded and shows up with an 8AN male adapter already installed. The overflow, supply, and return ports are all 8AN ORB threaded with 6AN male adapters already on there. Any of those can be swapped to other sizes if your setup calls for it (sold separately). For filtration, the brushless E5LM version uses a standard press-in filter sock, and every other pump version uses the stainless steel mesh inlet screen Radium provides for pre-pump filtration. The three filtration chambers are sealed off from each other, fuel can't cross between them, and if you're running fewer than 3 pumps you do NOT have to block off the empty port on the inlet screen. Ring terminals and hardware for your power connections come with every tank.
What You Get
- Radium Engineering Universal Multi-Pump Fuel Surge Tank (pumps NOT included)
- Runs 1, 2, or 3 fuel pumps (E5LM version: 1 or 2)
- Four variants by pump compatibility (20-1440 / 20-1441 / 20-1442 / 20-0443-00)
- Merged single outlet for simple external plumbing
- Pump staging supported (with check-valve pumps)
- 2024 redesign with tangential swirl pot for air/foam separation
- Anodized aluminum pump mounting bracket
- Anti-rotation high-current electrical studs
- Gas, ethanol, and methanol compliant internal wiring
- 10AN ORB pump outlet (8AN adapter preinstalled); 8AN ORB overflow/supply/return (6AN adapters preinstalled)
- All pump install parts and power connection hardware included
Variants And Pump Compatibility
- 20-1440: Walbro GSS342, AEM 50-1200, Deatschwerks DW440 (1-3 pumps)
- 20-1441: Deatschwerks DW400, Bosch BR540 (1-3 pumps; BR540 no check valve / can't stage; no 3-pump with optional level switch)
- 20-1442: Walbro F90000267/274/285/295, Protec 11928, Fuelab 49614, DW810 (1-3 pumps; F90000295 can't stage; brushless options need separate 13-1187 base)
- 20-0443-00: Ti Automotive E5LM / BKS1001, Injector Dynamics BPC100 (1-2 pumps; check valve adapters included; requires brushless controller)
Note: Radium Engineering Universal Multi-Pump Fuel Surge Tank (MPFST). Prevents fuel starvation on high-power vehicles with inadequate stock tank baffling by holding a buffer volume of fuel so the main pumps never see air. OEM in-tank pump acts as lift pump to keep the surge tank full; excess fuel returns to the main tank. Runs 1, 2, or 3 pumps (E5LM version 1 or 2) with merged single outlet and pump staging (check-valve pumps only). Pumps NOT included. Four variants: 20-1440 (Walbro GSS342/AEM 50-1200/DW440), 20-1441 (DW400/Bosch BR540 - BR540 can't stage, no 3-pump with optional level switch), 20-1442 (Walbro F90000267/274/285/295, Protec 11928, Fuelab 49614, DW810 - F90000295 can't stage, brushless options require separate 13-1187 base), 20-0443-00 (Ti Automotive E5LM/BKS1001, Injector Dynamics BPC100 - requires brushless controller). 2024 redesign adds tangential swirl pot for air/foam separation, expanded brushless pump support, anti-rotation high-current electrical studs, anodized aluminum pump bracket, and fuel-compliant internal wiring. 10AN ORB pump outlet (8AN adapter preinstalled); 8AN ORB overflow/supply/return ports (6AN adapters preinstalled); all swappable. MUST be plumbed per Radium's specified configuration to avoid function issues and premature failure: stock tank pump outlet to MPFST supply port, stock tank return inlet to MPFST overflow port, MPFST pump outlet to engine/fuel rail, MPFST return port to fuel pressure regulator return. Returnless vehicles must create a return port on the stock tank for the overflow - do NOT block it (see additional instructions PDF). Includes all parts to install pumps (except pumps) plus power connection ring terminals and hardware. One surge tank per order.