GMC CHEVROLET Silverado 6500HD 2019 Owner's Manual page 394

control operations; it also can
reduce engine life and/or jeopardize
the warranty.
Receipts covering the performance
of regular maintenance should be
retained in the event questions arise
concerning maintenance. The
receipts should be transferred to
each subsequent owner of the
engine (vehicle).
For information regarding routine
scheduled maintenance such as
replacement of oil, filters, coolant,
belts, belt tensioners, etc., and
inspection and adjustment of items,
such as valve lash, etc., refer to the
Engine Operation and Maintenance
Manual supplied with the vehicle.
Engine Fluids and
Contaminated Material
Engine fluids (oil, fuel, and coolant)
may be a hazard to human health
and the environment. Handle all
fluids and other contaminated
materials (such as filters, rags) in
accordance with applicable
regulations. Recycle or dispose of
engine fluids, filters, and other
contaminated materials according to
applicable regulations.
Fuel System
Frequently inspect the condition of
the fuel tanks and mounting
hardware, fuel tank cap and vent,
fuel lines, clips, and routing. At
every Preventive Maintenance (PM),
or daily if necessary, drain water
and sediment from the fuel/water
separator filter. Be sure to use the
proper fuel/water separator filter
element with the correct part
number and filter efficiency rating.
Fuel Tank Draining and Cleaning
Periodically (annually is
recommended) drain water and
sediment from the fuel tank. Drain
and flush sediment from the fuel
tank at least every 12 months or
more frequently if fuel quality or type
of fuel dictates.
Since Ultra-Low Sulfur Diesel
(ULSD) fuel tends to absorb more
water and engines are operating at
higher temperatures, microbe
Service and Maintenance
growth in the fuel tanks has become
more prevalent. Microbe growth
results in more contaminants in the
fuel and reduces fuel filter life. Since
fuel tank draining does not remove
all microbes, fuel tank draining
alone will not eliminate the problem.
If microbe growth is found in
the fuel:
1. Drain and clean the fuel tank(s)
every 12 months or more often.
Clean the tanks with a
professional fuel tank cleaning
system (available through your
dealer) or have your dealer
perform the service for you.
2. Treat the vehicle fuel tanks and
bulk tanks regularly with a
biocide from a reputable
vendor.
3. Purchase fuel only from
vendors that pretreat their fuel
with biocides.
4. Periodically test the fuel
supplied by your fuel vendor for
the presence of microbes.
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