Contaminants-In-Fuel Diagnosis

The fuel sample should be drawn from the bottom of the tank so that any water present in the tank will be detected. The sample should be bright and clear. If the sample appears cloudy, or contaminated with water (as indicated by a water layer at the bottom of the sample) use the following procedure to diagnose the fuel.

1. Using an approved fuel container, draw approximately 0.5 liter of fuel.
2. Place the cylinder on a level surface for approximately 5 minutes in order to allow settling of the particulate contamination.
3. Observe the fuel sample. If any physical contaminants or water are present, then clean the fuel system.

Particulate contamination will show up in various shapes and colors, such as sand will typically be identified by a white or light brown crystals, rubber particles typically as black and irregular. Rust may show up as brown, cloudy fuel or brown particles. Any particles that do show up regardless of color or shape are not acceptable, and the entire fuel system should be thoroughly cleaned.