Isuzu AU-4LE1T, Maintenance Manual

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(4) Handling of the Fuel
The fuel containing dust particles or water will cause engine failure.
Therefore, the following notice must be observed.
1) Take care to prevent the fuel from entry of dust particles or water when
filling the fuel tank.
When fueling is done from an oil drum directly, keep the drum
stationary over a long time so that clean fuel can be used after the dust
particles or water is completely sedimented.
2) Always fully fill the fuel tank. Drain the sedimented particles in the fuel
tank frequently by opening the tank draining hole.
(5) 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
happen 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 fuel filter
system on the engine which allows you to drain excess water.