10. Sufficient Clean Fuel Test

10. SUFFICIENT CLEAN FUEL TEST

NOTICE: 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 and sufficient fuel to start the engine.

Sufficient Clean Fuel Test
- Check for illumination of the water in fuel (WIF) indicator.
- Drain a fuel sample from the fuel conditioning module.







Recommended Procedure:
Open the drain valve integrated in the fuel conditioning module and drain fuel into a clear 1 liter container. Close the drain valve. The flow out of the drain valve should be steady and should produce at least 1 liter/1 quart of fuel within 2 minutes. If the volume of the fuel collected within 2 minutes is short of the required 1 liter/1 quart there may be insufficient amount of fuel in the tank and the fuel level may not be correctly indicated on the fuel level gauge. If a fuel level indication concern is suspected, refer to the Instrument Panel, Gauges and Warning Indicators to continue diagnosis.

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

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 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.

Fuel Conditioning Module Drain Valve:

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 may indicate that the tank and fuel system may need to be flushed and cleaned.

Tools Required:
Clear container - approximately O.95 L (1 quart)