C 1500 Truck 2WD V8-6.5L DSL Turbo VIN F (1998)
Fuel: Testing and Inspection
Contamination Testing
FUNGI IN FUEL SYSTEM
Fungi and other microorganisms can survive and multiply in diesel fuel if water is present. The fungi can be present in any part of the fuel handling
system. These fungi grow into long strings and will form into large globules. The growths appear slimy and are usually black, green, or brown. The
fungi may grow anywhere in the fuel but are most plentiful where diesel fuel and water meet. As the fuel is agitated (when service station tanks are
being filled), fungi are distributed throughout the tank and may be pumped into a vehicle.
SYMPTOMS FOR DETECTING FUNGI
Fungi use the fuel as their main energy supply and need only trace amounts of water and minerals. As they grow and multiply, they change fuel into
water, sludge, acids, and products of metabolism. The most common symptom is fuel filter plugging; however, various metal components (fuel tank,
pipes, and injection pump) can corrode.
WARNING: Avoid physical contact with the biocides in order to avoid personal injury.
STERILIZING THE FUEL SYSTEM
If fungi have caused fuel system contamination, use a diesel fuel biocide to sterilize the fuel system. Do not exceed the dosage recommended on the
label. Discontinue the use of a biocide when towing a trailer. It is permissible to have biocide in the fuel when starting to tow, but do not add any
biocide while towing. Steam cleaning may be necessary if most of the fungus growth cannot be removed with biocides.
The presence of water or gasoline in diesel fuel may also cause injection pump and nozzle damage. The following procedure checks for the presence
of water and gasoline in diesel fuel that may cause injection pump and nozzle damage.
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Remove the fuel filter element and inspect it.
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If water, gasoline or fungi/bacteria are not present, end the inspection.
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If water or fungi/bacteria are present, Go to Cleaning Water from the Fuel System. See: Service and Repair
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If gasoline is present, Go to Cleaning Gasoline from the Fuel System. See: Service and Repair
