Isuzu AU-4LE1T, Maintenance Manual

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Cleaning procedure
1) Turn the water sedimenter lever to the closed position.
CAUTION:
If the cup is removed without turning the lever as instructed,
the fuel may flow out.
2) Loosen the ring nut, remove the cup, and take out the element.
3) Clean the cup and element, install new packing on the ring nut.
4) Tighten the cup to the body securely with the ring nut.
5) After installation, turn the water sedimenter lever to the open position.
CAUTION:
1. With the lever positioned just above the fuel remains off,
and therefore, the engine cannot be started.
2. During removal, be careful not to stain the parts around
with the fuel in the cup.
3. After changing fuel filter element, conduct fuel air bleeding.