Yanmar 4BY, Service Manual, Page: 157 / 275

FUEL SYSTEM
6-28
BY Service Manual
Repair
Replacing Injector Return Fuel Line
1. Disconnect the battery negative (-) cable.
2. Shut off fuel supply valve.
3. Remove intake manifold. See Intake Manifold
on page 5-70 .
Figure 6-39
IMPORTANT
When working on the oil, coolant or fuel
circuits, you must protect the alternator
against contamination.
Cover alternator with suitable materials.
Failure to comply may result in an alternator
failure.
4. Press clip (Figure 6-39, (1)) in direction of
arrow and remove fitting (Figure 6-39, (2)) from
fuel injector top. Repeat with all fuel injectors.
IMPORTANT
NEVER disassemble fuel return line
assembly. No individual parts are available
and it must be replaced as a complete
assembly.
A
DANGER
FIRE AND EXPLOSION HAZARD!
• Diesel fuel is flammable and explosive
under certain conditions.
• When you remove any fuel system
component to perform maintenance
(such as changing the fuel filter) place
an approved container under the
opening to catch the fuel.
• NEVER use a shop rag to catch the
fuel. Vapors from the rag are
flammable and explosive.
• Wipe up any spills immediately.
• Wear eye protection. The fuel system
is under pressure and fuel could spray
out when you remove any fuel system
component.
• Failure to comply will result in death or
serious injury.
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