G643(E) Service Manual Chapter 2. Recommended Maintenance 27
Fuel System Maintenance
Replace LP Fuel Filter Element
Park the lift truck in an authorized refueling area with
the forks lowered, parking brake applied and the
transmission in Neutral.
1. Close the fuel shutoff valve on the LP-fuel tank.
Run the engine until the fuel in the system runs
out and the engine stops.
2. Turn off the ignition switch.
3. Scribe a line across the filter housing covers,
which will be used for alignment purposes when
re-installing the filter cover.
FUEL FILTER DISASSEMBLY (Steps 4-7)
4. Remove the cover retaining screws (1).
5. Remove top cover (2), magnet (3), spring (4), and
filter element (7) from bottom cover (5).
6. Replace the filter element (7).
7. Check bottom cover O-ring seal (6) for damage.
Replace if necessary.
8. Re-assemble the filter assembly aligning the
scribe lines on the top and bottom covers.
9. Install the cover retaining screws, tightening the
screws in an opposite sequence across the cover.
10. Open the fuel valve by slowly turning the valve
counterclockwise.
11. Crank the engine several revolutions to open the
fuel lock-off. DO NOT START THE ENGINE.
Turn the ignition key switch to the off position.
12. Check the filter housing, fuel lines and fittings for
leaks. Repair as necessary.
Testing Fuel Lock-off Operation
• Start engine.
• Locate the electrical connector for the fuel lock (A).
• Disconnect the electrical connector.
• The engine should run out of fuel and stop within a
short period of time.
NOTE
The length of time the engine runs on trapped fuel
vapor increases with any increase in distance
between the fuel lock-off and the pressure regulator
/converter.
• Turn the ignition key switch off and re-connect the
fuel lock-off connector.
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