Diesel Emissions Fluid Tank: Service and Repair

Fuel Tank Draining (Emission Reduction Fluid)

Caution: The diesel exhaust fluid (DEF) must be drained by a clean dedicated siphoning pump and hose. It must NOT have any traces of gasoline, diesel fuel, or any oil based substances. If extreme care is NOT taken to prevent contamination from fluids other than DEF, reduced performance and/or damage to the DEF system may result.

1. Ensure the ignition is OFF.
2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
3. Using only a Low pressure clean water hose, spray the upper surfaces of the Diesel Exhaust Fluid (DEF) Tank and pump supply module, the injection hose, and the fill hose assembly, to remove all dirt and debris.
4. Using only a Low pressure air wand or air gun, direct air along the same surfaces to both dry and remove any further contaminants.
5. Using a clean white shop towel, carefully dry connections and joints by hand to ensure dryness and cleanliness.
6. Insert the hose from the pump devise into the fuel tank.
7. Using a hand or air operated pump device, drain as much fuel from the tank as possible.




8. Collapse the spring clamp (1) and disconnect the filler hose.

Caution: The diesel exhaust fluid (DEF) system is part of the emission system for this vehicle, and must be serviced while observing extreme care to prevent foreign contamination of any kind from entering this system. If extreme care is NOT taken to prevent contamination from dirt, debris, fluids other than DEF, etc., reduced performance and/or damage to the DEF system may result.

* Cleanliness of the diesel exhaust fluid (DEF) system is crucial to ensure proper operation. Before opening any part of the DEF system, ensure connections and joints are thoroughly clean and dry of any dirt, debris, or other contaminants. Use only low pressure water and low pressure air, as directed.
* Diesel exhaust fluid (DEF) will have a tendency over time to develop areas of dried crystallization residue. Crystallization residue is a normal process for this fluid. Dried DEF crystallization residue can be wiped away, or flushed away with clean water, depending on location of the crystallization.

9. Use a had or air operated pump device in order to drain as much fuel through the filler hose.