Hitachi ZW180 Operator's Manual page 257

ZW310
Water separator (1) is a device to separate water mixed in
fuel. The water separator and the fuel main filter are com-
prised of one unit. The separated water accumulates in sep-
arator container (6). Before separator container (6) is filled
with water, be sure to drain water.
Drain procedures
1. Loosen drain valve (3) at the bottom of the case. Then,
press feed pump (4) to drain the accumulated water from
the water separator.
2. After draining water, close drain valve (3).
Bleed air from the fuel system
NOTE: If air is mixed in the fuel system, the engine may be-
come difficult to start or an engine trouble may occur.
After allowing the fuel tank to empty, draining the wa-
ter separator, or replacing the fuel pre-filter element,
be sure to bleed air from the fuel system. In case water
content in the fuel is high, shorten the check and drain
intervals.
1. Fill fuel in the fuel main filter by operating feed pump (4).
Then, close vent valve (2) by turning it clockwise.
2. Loosen plug (5). Press and hold feed pump (4) until fuel
with no air bubble included flows out of the plug.
3. Tighten plug (5). Open vent valve (2) by turning it coun-
terclockwise.
4. Press in the feed pump until it becomes hard to move.
5. Start the engine. Bleed air from the fuel system.
NOTE: Run the engine at slow idle speed for approx. 1 minute.
Air will be automatically purged out of the fuel system.
MAINTENANCE
7-57
4
1
6
5
2
3
M4GB-07-065