Before You Start:
* Safety First: Always wear appropriate safety glasses and gloves. Diesel fuel is flammable and can be harmful to skin. Work in a well-ventilated area.
* Engine Off & Cool: Ensure the engine is completely off and cool to the touch before attempting any maintenance.
* Gather Supplies: You'll need a suitable container (large enough to hold the contents of the separator), wrenches or sockets to fit the drain valves (usually a 1/4" or 3/8" drive), and rags or absorbent material to clean up any spills.
Typical Draining Procedure (varies slightly by model):
Most Detroit Diesel fuel separators have at least two valves: a water drain and a fuel drain. Some have a third for sediment.
1. Locate the Drain Valves: Find the drain valves on the bottom of the separator. They are usually clearly marked "Water" and "Fuel" (or similar).
2. Position Your Container: Place your container underneath the drain valves to collect the drained fluid.
3. Open the Water Drain Valve: Slowly open the water drain valve (usually a smaller valve). Water will drain out, often with a bit of sediment. Close the valve once the water stops draining.
4. Open the Fuel Drain Valve (optional): If your separator has a separate fuel drain, open it and allow the fuel to drain into your container. This is less critical than the water drain, as leaving a small amount of fuel in the separator isn't harmful. Close the valve when finished.
5. Sediment Drain (If Applicable): Some separators have a sediment bowl at the bottom with a drain. This usually requires removing a bowl or plug and carefully draining the sediment.
6. Inspect Drained Fluid: Observe the drained fluid for excessive water or sediment. This can indicate potential problems with your fuel system.
7. Clean Up: Wipe up any spills and properly dispose of the drained water and fuel according to local regulations.
Important Considerations:
* Consult Your Engine's Manual: The most accurate and reliable information on draining your specific Detroit Diesel fuel separator will be found in your engine's service manual. This manual will detail the exact location of the valves, the correct procedures, and any specific precautions.
* Valve Types: Some valves might be knurled for hand-tightening, while others may require wrenches. Don't force anything.
* Fuel Type: Ultra-Low Sulfur Diesel (ULSD) is more likely to contain water than older fuel types. More frequent draining may be required.
If you are unsure about any part of this process, consult a qualified mechanic. Incorrectly draining or maintaining your fuel system could lead to engine damage.
