Maintenance Section
-219-
Inspect Vacuum Lines and Fittings
(G420F(E)/G424F(E)/G424I(E)
Engine Only)
1. Visually inspect vacuum lines and fittings for
physical damage such as bittleness, cracks and
kinks. Repair/replace as required.
2. Slovent or oil damage may cause vacuum lines
to become soft resulting in a collapsed line
while the engine is running.
3. If abnormally soft lines are detected, replace as
necessary.
(1) Fuel Trim Valve(FTV)
(2) Vacuum lines
Fuel Trim Valve(FTV) Inspection
(G420F(E)/G424F(E)/G424I(E)
Engine Only)
1. Visually inspect the Fuel trim valve for
abrasions or cracking. Replace as necessary.
2. To ensure the valve is not leaking a blow-by
test can be performed.
3. With the engine off, disconnect the electrical
connector to the FTV.
4. Disconnect the vacuum lines form the FTV to
the pressure regulator/converter, at the
converter’s tee connection.
5. Lightly blow through the vacuum line connected
to the FTV. Air should not pass through the FTV
when de-energized. If air leaks past the FTV
when de-energized replace replace the FTV.
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