New Holland CX720 Operator's Manual page 391

Fuel storage
Many engine difficulties can be traced to dirty fuel,
therefore the importance of using clean fuel, properly
stored cannot be stressed too strongly.
Fuel prefilter/water separator
Drain the water from prefilter/water separator (1)
daily, proceed as follows:
1. Loosen the screw (2) to allow the water to run out
of the screw orifice.
2. Collect the water/fuel mixture and dispose
according to regulations.
3. Tighten the screw (2) when fuel free of water runs
out of the screw orifice.
The fuel prefilter/ water separator (1) should be
changed every 600 operating hours, or earlier, if a
drop in engine performance is experienced.
To change the prefilter/water separator, proceed as
follows:
1. Wipe the top of the prefilter/water separator head
clean.
2. Turn the fuel valve (3) to the closed position.
3. Unscrew the "spin-on" prefilter/water separator
(1), using a filter wrench.
4. Fill the new prefilter/water separator (1) with
clean fuel and apply a film of fuel to the gasket.
5. Screw on the new prefilter/water separator by
hand. Tighten firmly, but do not use tools.
6. Turn fuel valve (3) to the open position.
7. Bleed the fuel system (refer to paragraph headed
"Bleeding the fuel system").
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SECTION 4 – LUBRICATION AND MAINTENANCE
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