Bleeding The Fuel System - Yanmar 6LY3 series Operation Manual

Filling the Fuel Tank (Continued)
1. Clean the area around the fuel cap.
2. Remove the fuel cap from the fuel tank.
3. Stop fueling when gauge shows fuel
tank is full. NEVER overfill the fuel tank.
4. Replace the fuel cap and hand-tighten.
Over-tightening the fuel cap will
damage it.

Bleeding the Fuel System

A
DANGER
FIRE AND EXPLOSION
HAZARD!
• Diesel fuel is extremely
flammable and explosive
under certain conditions.
• When you prime the fuel
system, operate the fuel
priming lever of the
mechanical fuel pump several
times until the fuel filter cup is
filled with fuel.
• NEVER open the air vent valve
while the fuel system is being
primed. The fuel filter has an
internal air bleed port.
• Failure to comply will result in
death or serious injury.
6LY3 Operation Manual
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The engine has an automatic air bleed
system. Bleeding the fuel system is not
required for normal engine operation.
The fuel system needs to be bled under
certain conditions:
• 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 the fuel filter and draining the
fuel filter / water separator, or replacing a
fuel system component
To bleed the fuel system:
1. Loosen the air bleed screw at the top of
the fuel / water separator 2 - 3 turns.
When fuel with no air bubbles flows
freely, tighten the air bleed screw.
2. Loosen the air bleed screw of the fuel
filter 2 - 3 turns.
3. Move the knob on top of feed pump
several times to feed fuel. Continue to
move feed pump knob until fuel with no
air bubbles flows freely.
4. Tighten the air bleed screw.
NEVER use the starter motor to
crank the engine to bleed the fuel
system. This may cause the
starter motor to overheat and
damage the coils, pinion and / or
ring gear.
0000016en
BEFORE YOU OPERATE
IMPORTANT
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