1. Verify the sealing O-ring that is
supplied with the filter kit is
installed on the fuel filter cap and
lightly coat the O-ring with fuel.
2. Install the new fuel filter cartridge to
the cap, then insert into the fuel
module.
NOTE
Depending on the vehicle’s fuel sys-
tem configuration the fuel filter housing
may not completely drain of fuel. If this
is the case, take care when installing
the new filter as this may cause fuel to
spill from the filter housing.
3. Tighten the fuel filter cap by
rotating it clockwise until the filter
cap O-ring makes contact with the
fuel module. Then tighten the filter
cap to 30 lb-ft ± 6 (40 N·m ± 8) as
specified on the filter cap.
4. If installing a new fuel filter on a
PX-7, loosen the fuel priming pump
knob by rotating it counter-
clockwise.
NOTE
The PX-9 uses an electric priming
pump. If installing a new fuel filter on a
PX-9 engine first vent the fuel system
at the quick-disconnect fitting at the
pressure side filter head inlet. The vent
overflow may be routed back to the
fuel tank, or, into a vented container.
Cycle the ignition switch to the ON po-
sition every 2 minutes (to power the
electric lift pump) until fuel appears in
the chassis-mounted fuel filter housing
and a solid stream of fuel flows out of
the vent., then skip to Step 6.
5. Operate the priming pump by
moving the knob in and out for 150
seconds. During this time the
pumping resistance will increase
but the full time is required to fully
prime the fuel system. Then tighten
the knob by rotating it clockwise.
CAUTION
Operate priming pump at a maximum
rate of 30 strokes per minute to pre-
vent damage to pump.
6. Check for leakage at the fuel filter
cap. Tighten if necessary.
WARNING
Check the fuel filter for signs of leak-
age. DO NOT smoke or allow an open
flame in close proximity. Failure to do
so could ignite a fire or cause an ex-
plosion which could result in serious
injury to you and/or bystanders. Fail-
ure to comply may result in death, per-
sonal injury, equipment or property
damage.
7. Start the engine and allow it to idle
for several minutes. Note that it
could take up to 15 seconds of
cranking for the engine to start. If
the starter is engaged for longer
than 20 seconds without starting,
additional priming pump actuation
may be necessary.
ENGINE MAINTENANCE - Maintenance Procedures
Y53-1183-1G1 (05/19) 61
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