Particulate Contaminants in Fuel Testing Procedure

Using an approved fuel container, draw approximately 0.5 liter (0.53 qt) of fuel.
Place the container on a level surface for approximately 5 minutes in order to allow settling of the particulate contamination. Particulate contamination will show up in various shapes and colors. Sand will typically be identified by a white or light brown crystals. Rubber will appear as black and irregular particles.
Observe the fuel sample. If any physical contaminants or water are present, clean the fuel system.