Yanmar 4BY, Service Manual

Page: 142 / 275

FUEL SYSTEM
BY Service Manual 6-13
Repair
REPAIR
IMPORTANT
After completing work that involves opening
the fuel system do the following:
Bleed the system. See Bleeding the Fuel
System on page 6-29.
Start engine and check for leaks. Allow
engine to run until it is running smoothly.
Check and delete any trouble codes that are
registered in the ECU after the work has
been completed.
Removal of Fuel Injector
IMPORTANT
When working on the oil, coolant or fuel
circuits you must protect the alternator from
contamination. Cover alternator with
suitable materials. Failure to comply may
result in an alternator failure.
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 5-70.
4. Remove return fuel line from fuel injector. See
Replacing Injector Return Fuel Line on
page 6-28.
Figure 6-7
5. If removing only one fuel injector, remove the
clamp (Figure 6-7, (1)) joining the fuel injector
lines to each other.
6. Remove high-pressure fuel line
(Figure 6-7, (2)) from injector and fuel rail. See
Removing and Installing High-Pressure Fuel
Lines on page 6-17.
CAUTION
• ALWAYS be environmentally
responsible.
• Follow the guidelines of the EPA or
other governmental agencies for the
proper disposal of hazardous
materials such as engine oil, diesel
fuel and engine coolant. Consult the
local authorities or reclamation facility.
• NEVER dispose of hazardous
materials irresponsibly by dumping
them into a sewer, on the ground, or
into ground water or waterways.
• Failure to follow these procedures may
seriously harm the environment.
0000013en
CAUTION
Immediately cap or plug all openings to
prevent contamination of system.
0000199en
000 3 677
(1)
(2)