Replace High-Pressure Fuel Regulator - Yanmar BY Series Service Manual

Repair
12/05
Replace High-Pressure Fuel
Regulator
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.
NOTICE: Immediately cap or plug all openings
to prevent contamination of system.
3. Remove intake manifold and cover open ports
in cylinder head to prevent foreign objects from
entering engine. See Intake Manifold on
page 5-66.
4. Disconnect electrical connector
(Figure 12-31, (1)).
Figure 12-31
Figure 12-31
BY Service Manual
5. Hold sensor hex (Figure 12-31, (2)) with
wrench and loosen retaining nut
(Figure 12-31, (3)).
6. Remove regulator from fuel rail.
7. Install new regulator in fuel rail. Ensure
orientation is correct. NOTICE: The
high-pressure fuel regulator can be installed
ONLY once. When installing a new regulator,
ensure it is correctly positioned before
tightening to specification.
8. Hold hex of regulator and tighten retaining nut
to 82.5 N·m (61 ft-lb).
9. Connect electrical connector.
10. Install intake manifold. See Intake Manifold on
page 5-66.
11. Open all fuel supply valves.
12. Connect battery negative (-) cable.
13. Bleed fuel system. See Bleed the Fuel System
on page 6-22.
14. Start engine and check for fuel leaks.
15. Check and delete any trouble codes that are
registered in the ECU after the work has been
completed.
0003684
© 2009 Yanmar Marine International
ELECTRICAL AND ECU
12-25