Yanmar 4TNV98, Service Manual

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4TNV98 & 4TNE98 Diesel Engine Section 1. General Service Information 15
Priming the Fuel System
The fuel system needs to be primed under certain
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.
To prime the fuel system on engines equipped with
an electric fuel pump:
1.
Place an approved container under the air bleed
port.
2.
Loosen the air bleed port 2 or 3 turns.
3.
Turn the key to the ON position for 10 to 15
seconds or until the fuel coming out of the air
bleed port is free of bubbles.
4.
Tighten the air bleed port.
5.
Wipe up any spills and properly dispose of fuel.
6.
NEVER use the starter motor to crank the engine
in order to prime the fuel system. This may cause
the starter motor to overheat and damage the
coils, pinion and/or ring gear.
To prime the fuel system on engines not equipped
with an electric fuel system:
1.
Place an approved container under the air bleed
port.
2.
Loosen the air bleed port
(Figure4-4, (1))
2 or 3
turns.
3.
Operate the fuel priming pump
(Figure4-4, (2))
until the fuel coming out of the air bleed port is
free of bubbles.
4.
Tighten the air bleed port.
5.
Wipe up any spills and properly dispose of fuel.
6.
NEVER use the starter motor to crank the engine
in order to prime the fuel system. This may cause
the starter motor to overheat and damage the
coils, pinion and/or ring gear.
Figure 4-4