DD15 Improper Grade of Diesel Fuel

Check as follows:‪

  1. Acquire a fuel sample from the vehicle fuel tank(s).
  2. Submit fuel sample for an ASTM test analysis.
    1. If the fuel meets specifications, check for a restrictive air cleaner; refer to “6.3 Restricted Air Cleaner Element” .
    2. If the fuel did not meet specifications, drain the fuel oil tanks, refer to OEM guidelines, and dispose of properly.


      Use only Ultra-Low Sulfur Diesel (ULSD) fuel (15 ppm sulfur content maximum), based on ASTM D2622 test procedure.‪
  3. Refill the fuel tanks with new ultra-low sulfur diesel fuel.
    To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪
  4. Start and run the engine.
  5. Run the engine at idle with a no-load for approximately five minutes, allowing the engine coolant to reach normal operating range.
  6. Visually inspect exhaust for excessive smoke.
    1. If the engine exhaust smoke emission appears normal, no further troubleshooting is required. Shut down the engine.
    2. If the engine exhaust smoke is excessively black or gray, shut down the engine. Check the air filter; refer to “6.3 Restricted Air Cleaner Element” .

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