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Universal Fuel Surge Tanks



Universal Fuel Surge Tank

Fuel surge tanks have been around for quite some time but still, many enthusiasts don’t know what they do or why they might need one. For the most part, surge tanks are used to ensure a constant supply of fuel on race/drift cars which can be prone to fuel starvation during high lateral G’s. The secondary use for a surge tank is to prevent fuel starvation on a carburetor to fuel injection conversion. The problem with most carbureted cars is their fuel tanks aren’t designed to support a fuel-injected engine. The reason is that carburetors have a built-in fuel bowl, which stores enough fuel to keep a constant fuel supply, even if the pump runs dry for a short period. In contrast, most fuel-injected cars are designed with a reservoir built around an in-tank pump to ensure a constant supply of fuel to the engine.

The fuel starts at the factory tank and gets drawn into the low-pressure pump. The pressurized fuel then flows into the surge tank and out toward the engine. Along the way, the fuel goes into an inline high-pressure EFI pump and out to the injectors. At this point, the pressure of the fuel is controlled by the fuel pressure regulator and feeds the engine. Any remaining fuel then returns to help refill the surge tank. As the surge tank reaches its maximum capacity, the excess fuel returns back to the main fuel tank.

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