Isuzu AU-4LE1T, Maintenance Manual

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Your engine is designed to use either Number 1-D or Number 2-D diesel fuel.
However, for better fuel economy, use Number 2-D diesel fuel whenever
possible. At temperatures less than -7°C, (20°F), Number 2-D fuel may
pose operating problems (see "Cold Weather Operation" which follows). At
colder temperatures, use Number 1-D fuel (if available) or use a "winterized"
Number 2-D (a blend of Number 1-D and Number 2-D). This blended fuel is
usually called Number 2-D also, but can be used in colder temperatures than
Number 2-D fuel which has not been "winterized. " Check with the service
station operator to be sure you get the properly blended fuel. Note that
diesel fuel may foam during a fill-up. This can cause the automatic pump
nozzle to shut off even though your tank is not full.
CAUTION:
Do not use home heating oil or gasoline in your diesel engine;
either may cause engine damage.
(3) Replacement Fasteners
CAUTION:
Fuel may be under pressure. Remove the fuel cap slowly to
prevent fuel from spraying out and causing injury.
NOTICE:
Always use diesel fuel.
Use of low quality fuel may adversely affect the engine parts,
and cause failure.
Use of other than specified fuel may adversely affect the
engine or emission control system and cause failure.
If other than specified diesel fuel is used, the machine may not
conform to specifications.