2. Unbend spring clips and take out the air valve 15 of a bulk pipe of a fuel tank.
3. Blow the valve air; when the lever 1 is in a starting position, as is shown in drawing, the valve 2 should be closed. Press the lever 1 in a direction specified by an arrow, the valve should open. If the valve is opened or closed at both positions of the lever 1, means, it is faulty also it it is necessary to replace.