Recommended Procedure:
Open the drain valve on the fuel control module and fill a clear container until it is half full. Close the drain valve.
Observe the water in fuel indicator. If the indicator is illuminated, the fuel is probably contaminated with water.
Flow out of the drain should be a steady stream. Insufficient flow could indicate fuel supply or fuel system problems.
Inspect the fuel in the container. It should be clear, not cloudy. It also should be free of water and contaminants. Dyed red or blue fuel indicates off-highway fuel.
Some sediment and water may be present in the fuel sample if the fuel filter has not been replaced for a prolonged period of time and/or if the sediment and water have not been drained recently. If that is the case, a second sample may be required to determine fuel quality.