POWER SYSTEM
TB20J Plus Maintenance Manual 67
© Feb. 2023
Vent the Fuel Lines
NOTICE
Failure to vent the fuel lines may bring damage to the
high-pressure pump of the injection system.
The fuel lines is vented through the electric fuel supply
pump. If the pre-filter is of integrated electronic fuel
transfer pump structure, this operation is not necessary.
To avoid false fault messages, do not attempt to start
the fuel system while venting.
Fig 13 Fuel pre-filter
1. Hand pump (on pre-
filter)
2. Venting screw
Fig 14 Fuel fine filter
1. Venting screw
2. Oil outlet connection
Fig 15 Fuel injection
pump
1. Venting screw
1. Loosen the venting screw on the pre-filter, press the
hand pump on the pre-filter, and tighten the venting
screw on the pre-filter when there is continuous
bubble-free fuel flowing out of the venting screw.
2. Loosen the venting screw on the fine filter (if there is
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