How Fuel Water Separator works? Pulldown Fuel tank for cleaning.

Service Inspection
Fuel Air Bleeding
1. Press the priming pump until it gets stiff.
Caution: Insufficient air removal may lead to engine malfunction.
Water Note:
If the water sedimentor warning light turns ON, follow the procedures described below:
a. Install a hose to the drain plug (install it on the tip of the drain plug).
b. Prepare a container (place it on the end of the hose attached to the drain plug).
c. Drain water from the sedimenter.
Note: - loosen the drain plug and drain the water. -
Press the priming pump several times to completely drain water.
d. Tighten the drain plug using a wrench. Tightening Torque: 3 N-m (0.3 kg-m / 27 ft-lb)
e. Turn ON the ignition switch Note: - Turn ON the ignition switch for 15 secs. and check for fuel leakage. - Confirm that the water sedimenter warning light is turned OFF.