3. Sufficient Clean Fuel Test

3. SUFFICIENT CLEAN FUEL TEST

CAUTION: Only use ultra low sulfur diesel fuel that is 5% or less biodiesel with this vehicle. Use of any other fuel type may damage the vehicle or cause an emission concern. Refer to the Owner's Literature for more information.

Purpose:
The purpose of this test is to verify the fuel quality.

Sufficient Clean Fuel







- Check for illumination of the water in fuel (WIF) indicator.
- Drain a fuel sample from the fuel conditioning module.
- A cetane rating between 40 and 50 is recommended for optimum performance.

Recommended Procedure:

Fuel Conditioning Module Drain Valve:

Open the drain valve integrated in the fuel conditioning module and fill a clear container until it is half full. Close the drain valve.

Observe the WIF indicator. If the indicator is illuminated, the fuel may be 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.

The fuel sample should not indicate evidence of waxing or gelling. Waxing or gelling in some fuels in cold weather could clog fuel filters and the fuel pump and cause restrictions in the fuel or low fuel pressure.

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.

Possible Causes:
- Biodiesel-water separation, seal degradation, corrosion
- Corrosion to fuel system components
- No fuel in the tank
- Fuel supply line broken or crimped
- Fuel jelled
- Fuel quality
- Pickup tube screen in tank restricted
- Restricted fuel filters

Cloudy fuel indicates that the fuel may not be a suitable grade for cold temperatures.

Excessive water or contaminants indicates that the tank and fuel system may need to be flushed and cleaned.

Tools Required:
Clear container - approximately 0.95 L (1 quart)