Fuel Cock Why a Small Valve Stops the Leaks

On the day the machine is put away, that small valve on the fuel tank is the last thing to cross your mind, and the first you should remember. Close it and the fuel stops seeping into the carburetor; turn it open the next morning and the engine starts more easily. The fuel cock is that little switch that manages the fuel.

Why does a machine need one? Small engines feed fuel by gravity, from the tank down to the carburetor. If the supply is left open, fuel keeps creeping into the float bowl, and after the machine sits the bowl overflows, fuel drips onto the ground, and the air smells of petrol. Close the tap and the fuel cuts off, keeping things clean and safe.

What is the part like? The body is cast alloy with a metal lever on top and a linkage rod behind it. Pull the lever on the tank and it moves this valve open and closed, so you do not have to reach up to the tank to twist it. The outlet at the bottom is brass, and the fuel line clips straight on.

There are three outlet directions, so which to choose? Straight points down, right points to the side, and dual has two ports that can run two lines. It depends on the original tank port and the way the fuel line runs. When the old valve still works, use it as the guide, match the same direction, and it will fit back without a fight.