Bleed The Fuel System - Yanmar BY Series Service Manual

FUEL SYSTEM
9. Connect the battery negative (-) cable.
10. Bleed the fuel system. See Bleed the Fuel
System on page 6-22.
11. Start engine and check for fuel leaks.
WARNING! Piercing Hazard. NEVER check
for fuel leaks with your hand. ALWAYS use a
piece of wood or cardboard.

Bleed the Fuel System

The fuel system needs to be bled under the
following conditions:
• Before starting the engine for the first time.
• After running out of fuel and fuel has been added
to the fuel tank.
• After fuel system maintenance such as changing
a fuel filter, draining the fuel filter / water
separator or replacing a fuel system component.
The fuel feed pump is ECU-controlled and will
operate for only 10 seconds when the key switch is
turned to ON and the engine is not running or being
started. For this reason, the key switch must be
repeatedly turned to ON then to OFF to sufficiently

bleed the fuel system.

1. Turn the key switch to ON and leave on for 10
seconds.
2. Turn key switch to OFF for 5 seconds, then turn
key switch to ON for 10 seconds.
3. Repeat steps 1 and 2 five more times.
Note: The engine may run rough and misfire
for a few seconds when first started until
any remaining air is purged from the fuel
system.
4. Attempt to start the engine. If the engine does
not start within a reasonable time, repeat steps
1 and 2 until the engine starts and runs.
6-22
© 2009 Yanmar Marine International
BY Service Manual
Repair