Bleeding The Fuel System - Yanmar 6SY Series Operation Manual

2. Remove the fuel cap from the fuel tank.
WARNING! Wipe up all spills
immediately. Keep sparks, open
flames or any other form of ignition
(match, cigarette, static electric
source) far away when refueling.
3. Stop fueling when the gauge shows the
fuel tank is full. NOTICE: NEVER overfill
the fuel tank.
4. Replace the fuel cap and hand-tighten.
Over-tightening the fuel cap will
damage it. WARNING! Store any
containers containing fuel in a well-
ventilated area, away from any
combustibles or sources of ignition.

Bleeding 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 the fuel filter and draining the
fuel filter / water separator, or replacing a
fuel system component.
( 1 )
Figure 2
1. Install a transparent plastic hose on the
fuel rail bleeder valve (Figure 2, (1)).
Place the hose in an appropriate
container.
6SY Operation Manual
2. WARNING! ALWAYS wear safety
glasses when bleeding the fuel
system. Open the bleeder valve and
operate the hand pump
(Figure 2, (2)) until fuel flows without
air bubbles. This may take 130 to 150
pump strokes.
3. Close the bleeder valve and remove the
hose.
4. Continue hand pumping until there is
resistance:
• Approximately 20 strokes after
• Approximately 50 strokes after
5. Start the engine and check for leaks.
NOTICE: NEVER hold the key in the
START position for longer than 15
seconds or the starter motor will
overheat.
If the engine fails to start after
bleeding:
• Open the bleeder valve again and operate
the hand pump until fuel without air
bubbles flows out.
• Tighten the bleeder valve. Start the
engine and check for leaks.
( 2 )
0004474
BEFORE YOU OPERATE
replacing the fuel filter
replacing a fuel injector
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