Inspecting for Fuel Contaminants

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Test the fuel specific gravity and record the results. Refer to Fuel System Specifications .
Remove the fuel filter and inspect the inside area of the fuel filter for dirt, water deposits, or other debris.
Drain the fuel filter into an approved clear container and allow the contents to settle. Observe the container for contaminant separation.
Remove the water-in-fuel sensor from the bottom of the fuel filter and inspect inside the filter for rust deposits, dirt, or other debris.

NOTE: The presence of water or gasoline in diesel fuel may also cause damage to other fuel system components.

If contaminants are present in the fuel or in any of the inspected areas, remove the fuel lines to the injectors and inspect the fuel injector return outlets and feed inlets for rust or corrosion.

Replace the fuel injectors if rust or corrosion is present. Refer to Fuel Injector Replacement (Right) or Fuel Injector Replacement (Left) and Fuel System Cleaning .
If rust or corrosion was not present in the injectors, but contaminated fuel was present, refer to Fuel System Cleaning and attempt to start and run the engine after procedure is completed.