Water In Fuel - Chevrolet 4500 HD 2023 Manual

230 Driving and Operating
Do not use home heating oil or gasoline in
your diesel engine; either may cause engine
damage.
The addition of kerosene will not unplug a
filter plugged with wax. Warming a "waxed"
filter to a temperature of 0 °C to 10 °C (32 °F
to 50 °F) will return the wax to solution.
Filter replacement is not normally required.

Water in Fuel

During refueling, it is possible for water (and
other contaminants) to be pumped into your
fuel tank along with the diesel fuel. This can
occur if a service station does not regularly
inspect and clean its fuel tanks, or if a
service station receives contaminated fuel
from its supplier(s).
To protect your engine from contaminated
fuel, there is a water separator system on
the engine which allows you to drain excess
water from the fuel.
Warning
The drained water/diesel fuel mixture is
flammable, and could be hot. To help
avoid personal injury or death and/or
property damage, do not touch the fuel
Warning (Continued)
coming from the water separator drain
valve, and do not expose the fuel to open
flames or sparks.
Be sure you do not overfill the drain pan.
Heat (such as from the engine) can cause
the fuel to expand. If the container is too
full, fuel could be forced out of the pan.
This could lead to a fire and the risk of
personal injury and/or vehicle damage.
Biocides
In warm or humid weather, fungus, and/or
bacteria may form in diesel fuel if there is
water in the fuel.
Fungus or bacteria can cause fuel system
damage by plugging the fuel lines, fuel
filters or injector. They can also cause fuel
system corrosion.
If fungus or bacteria has caused fuel system
problems, you should have your authorized
dealer correct these problems. Then, use a
diesel fuel biocide to sterilize the fuel
system (follow the biocide manufacturer's
instructions). Biocides are available from
your dealer, service stations, parts stores
(Continued)
and other automotive places. See your
authorized dealer for advice on using
biocides in your area and for
recommendations on which biocides you
should use.
Smoke Suppressants
Because of extensive testing of treated fuel
versus untreated fuel, the use of a smoke
suppressant additive is not recommended
because of the greater possibility of stuck
rings and guttered valves, resulting from
excessive ash deposits.
Water Separator
The purpose of the water separator is to
separate any water from the fuel that may
have formed in the fuel tank due to
condensation.
The water separator is located on the
bottom of the pre-fuel filter.
Caution
Remaining water that is not discharged
from the water separator could freeze
and damage the vehicle.
If the warning light comes on while the
engine is in operation, promptly drain the
water from the water separator (pre-fuel
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