Replace High-Pressure Fuel Rail Pressure Sensor; Replace Fuel Temperature Sensor - Yanmar BY Series Service Manual

ELECTRICAL AND ECU
Replace High-Pressure Fuel Rail
Pressure Sensor
NOTICE: When working on the oil, coolant or fuel
systems, you must protect the alternator from
contamination. Cover alternator with suitable
materials. Failure to comply may result in an
alternator failure.
1. Disconnect battery negative (-) cable.
2. Shut off all valves in the fuel supply system.
3. Disconnect electrical connector from sensor
(Figure 12-32, (1)).
Figure 12-32
( 1 )
( 2 ) ( 1 )
Figure 12-32
4. Hold sensor hex (Figure 12-32, (2)) with
wrench and loosen retaining nut
(Figure 12-32, (3)).
5. Remove sensor from fuel rail.
6. Inspect threads of sensor. Replace sensor if
damage is evident.
7. Inspect the O-ring and replace if necessary.
8. Apply a light coating of petroleum jelly to O-ring.
9. Install sensor in fuel rail. Ensure orientation is
correct. NOTICE: The high-pressure fuel
sensor can be installed a maximum of ten
times. After ten installations, a new sensor must
be installed.
10. Hold hex of sensor and tighten retaining nut to
70 N·m (52 ft-lb).
11. Connect electrical connector to sensor.
12. Open all fuel supply valves.
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0003683
© 2009 Yanmar Marine International
13. Connect battery negative (-) cable.
14. Bleed fuel system. See Bleed the Fuel System
on page 6-22.
15. Start engine and check for fuel leaks.
16. Check and delete any trouble codes that are
registered in the ECU after the work has been
completed.

Replace Fuel Temperature Sensor

1. Disconnect the battery negative (-) cable.
2. Shut off all valves in the fuel supply system.
3. Remove intake manifold. See Intake Manifold
on page 5-66.
4. Disconnect electrical connector from sensor
(Figure 12-33, (1)).
Figure 12-33
( 2 )
Figure 12-33
5. Loosen hose clamps (Figure 12-33, (2)) and
remove hoses from sensor.
6. Installation is in the reverse of removal.
7. Install intake manifold. See Intake Manifold on
page 5-66.
8. Open all fuel supply valves.
9. Connect the battery negative (-) cable.
10. Bleed fuel system. See Bleed the Fuel System
on page 6-22.
11. Start engine and check for fuel leaks.
BY Service Manual
Repair
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0003688A