Measure the level of fuel at the start and end of the 24 hour period. Compare the measurements for signs of fuel loss. These measurements will be more consistent if done at least 24 hours after a fuel delivery. Visually inspect the above ground part of the system for leaks twice a month. Fuel tanks should be regularly checked for water.
Water settles to the bottom of the tank, allowing measurement of the amount of water present.
When dipping tanks, smear five to six inches of water paste at the bottom of the dip stick or tape. Water paste is available from petroleum equipment suppliers. If water is present, the paste will change color, from yellow to red. Water invades tanks through leakage or condensation. Spillage Spillage usually occurs because of operator negligence when filling equipment or fuel storage tanks.