Yanmar BY series, Service Manual

Page: 156 / 275

FUEL SYSTEM
BY Service Manual 6-27
Repair
Removing and Installing Fuel Rail
1. Disconnect the battery negative (-) cable.
2. Shut off fuel supply valve.
3. Remove intake manifold. See Intake Manifold
on page 5-70 .
Figure 6-37
4. Use special socket (Figure 6-37, (2)) to loosen
clamp (Figure 6-37, (1)) . Remove hose.
Figure 6-38
5. Remove all high-pressure fuel lines
(Figure 6-38, (1)) . See Removing and Installing
High-Pressure Fuel Lines on page 6-17.
6. Disconnect electrical connectors from fuel
pressure sensor (Figure 6-38, (2)) and fuel
pressure regulator (Figure 6-38, (3)) .
7. Remove bolts (Figure 6-38, (4)) and remove
fuel rail from engine.
8. If removed, install fuel return hose fitting with
new seal washers. Tighten banjo bolt to 25 N·m
(221 in.-lb).
9. Install fuel rail on engine. Install and tighten
bolts.
10. Connect return hose and tighten clamp using
special socket.
11. Connect electrical connectors to fuel pressure
sensor and fuel pressure regulator.
12. Install high-pressure lines. See Removing and
Installing High-Pressure Fuel Lines on
page 6-17.
13. Install intake manifold. See Intake Manifold on
page 5-70.
14. Open fuel supply valve.
15. Bleed fuel system. See Bleeding the Fuel
System on page 6-29.
16. Start engine and check for fuel leaks.
000 3 6 8 9
(1)
(2)
000 3 677B
(
3
)
(2)
(1)
(4)
(1)
A
WARNING
HIGH PRESSURE HAZARD!
• Avoid skin contact with high pressure
diesel fuel spray caused by a fuel
system leak such as a broken fuel
injection line. High pressure fuel can
penetrate your skin and result in
serious injury. If you are exposed to
high pressure fuel spray, obtain
prompt medical treatment.
• NEVER check for a fuel leak with your
hands. ALWAYS use a piece of wood
or cardboard. Have your authorized
Yanmar marine dealer or distributor
repair the damage.
• Failure to comply could result in death
or serious injury.
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