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What in?

I've heard them described as a 'de-aeration device'.

Basically, they provide a constant head of fuel to the EFI pump, so that, even on a near empty tank during hard cornering, you will always have fuel available for the EFI pump.

In-tank pumps have a sort of box surrounding the pump pick point.

In an external setup, you have a low-pressure pump which keeps the tank supplied with fuel from the fuel tank, and also excess fuel from the rail returns to the surge tank. Any 'overflow' returns to the fuel tank.

Most factory EFI cars already have them installed somewhere.

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There's nothing to be gained performance-wise, other than you won't run out of fuel on a hard corner with a low fuel load.

Checkout www.efihardware.com

If you're already running a (factory) EFI car, then you shouldn't need one (I'm guessing your nic says you have a R34 GTt)

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as has been said surge tanks are used to provide constant supply of fuel to a large fuel pump. there are no horsepower gains but many people recommend them when installing a bigger fuel pump, especially if that fuel pump is too big for the std tank.

it would only be neccessary if a)doing trackwork and needing constant supply of fuel given corenering etc

b)have big fuel system and pump which is external and requires a surge tank

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