![]() 16 goes to the main mechanical pump the other comes out of the surge into an inline pump (044 for eg) then through a high flow check valve and tee's it into the main supply line, from bottom of surge to inlet of fuel pump. It's a big line but fuel surge tanks in the back cause main fuel lines to cavitate and they need all the help they can get. Then you run 1 -10 line that loops around to the main feed with the prime pump helping that main line being -16 to stay pressure positive. Run a lift pump from main tank to the surge (oem line, or -6 is all that required much like the tank in front system above) (the line should be big enough to allow fuel to travel one way and air to travel the other way ideally).įor Surge tanks in the back (if you must) of the car Larger surge recommended, the higher the better unless you run a prime pump then it does not matter. Then continue the same back to the surge tank (-8 or -10 whatever size went into the rail) Then from surge to main tank, preferably -10 or -12 so you can vent the tank and not build a vacuum when the mech pump is pulling more than the lift can supply. ![]() (Kinsler regulators are high precision and calibrated and will be impacted with any foreign matter larger than 10 micron). Then from the outlet of the pump you usually use -8 for the series 1 pumps and -10 for the series 2 pumps, through a fuel filter 10 micron, to injector rail, or at least filter before regulator. Then run a -10 line (up to Kinsler 700 Tough pump series 1, series 2 tough pumps use -12 inlets from 800 - 1300 pumps, and you can go -16 for the bigger 1300- 1600 pumps) from the bottom of surge tank to inlet of the fuel pump as mentioned. Starting from the main fuel tank, plumb the lift pump inside the tank to the surge tank using either OEM line or -6 (both are fine) to the surge in the front of the car through a 100 micron filter, a stock pump or small Walbro 255 for example flows near double when its not under pressure. There is no rubbing or interference from the suspension by running it this way.Surge tank in the front (is strongly recommended) Our Subaru WRX/STI surge tank kit hoses run up and over the rear subframe and into the tank. Here is a photo from under the car showing the fuel tank side of the plumping. Here you see the plumping to the Walboro 400 fuel pump. The hoses on the left side route to the fuel pump. From this angle, you can see the wiring leading up the rear of the car to a power source. Two hoses enter the rear from the tank (right side leads). It made the most sense when taking into consideration the wiring for both the power and the plumbing for the cars gas tank. We are in the final stages of R&D on a complete kit which will include this Radium Surge Tank along with all of the necessary fittings, hoses and mounting brackets for a pain free installation! Enough of the technical information, here are the pictures! We mounted this Surge Tank horizontally in the trunks spare tire recession. If you're contemplating a WRX / STI surge tank stay tuned. ![]() A sudden lean mixture condition at high speeds could result in serious engine damage, leaving your high performance rally machine nothing but a glorified yard-ornament. This is particularly dangerous with a turbocharged engine like the one in the Subaru WRX. In that moment, the injectors would be getting no fuel and the engine would cut out. EFI car pump runs at very high pressure and the fuel is circulated to the fuel rail and back very rapidly, and if the pickup becomes uncovered momentarily, the pump could draw in air and purge all of the fuel from the entire system. The purpose of a fuel surge tank is to prevent your Subie from fuel system starvation when running at a low fuel level, under hard cornering, or drag racing. Below are a few photo's highlighting the installation process. You'll need some wiring skill, but otherwise it's a simple design and the install is as simple as running a few fuel lines and drilling a few holes for the optional mounting bracket. ![]() It is a relative straight forward install, and was done in a short amount of time. Recently we performed a Radium Engineering fuel surge tank installation on a 2005 Subaru STI at our Minnesota based performance shop. ![]()
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