MAINTENANCE
Page 89
FUEL FILTER REPLACEMENT
Fuel Filter Change
[231 BA]
FILTER DESCRIPTION
Two filters ensure that clean, waterless fuel
reaches the electronic unit injectors. One is a
full-flow filter, the other is a water separating
pre-filter with a transparent cup to collect and
drain the water. A water-in-fuel sensor informs the
driver of excessive accumulation in the cup. The
water separating pre-filter is in the “suction side”
of the fuel circuit. It is a spin-on type with one end
of its casing threaded to receive the cup.
The full flow-filter is on the “pressure side” of the
fuel circuit. It is also an easily replaced spin-on
filter. The casing completely encloses the filter
element. This filter is rated at 3–5 microns.
80
Figure 80 — Fuel Filters
FUEL FILTER REPLACEMENT
Because of ice buildup or fuel waxing which can
clog fuel filters, it may be necessary during
extremely cold weather to reduce the time or
mileage interval between fuel filter changes.
Be careful to prevent foreign matter of any kind
from entering the filters during service.
Install new fuel filters dry.
Water Separating Pre-Filter Replacement
To replace the water separating pre-filter:
1. Disconnect the electrical cable.
2. Make sure the filter casing is thoroughly
cleaned. If not already done, wash the area
around the filter mounting adapter with a
suitable solvent and blow dry with
compressed air.
3. With a suitable container in place to collect
spillage, open the fitting and drain the filter.
4. Unscrew and remove the water cup.
5. Using a filter wrench, remove the filter from
the mounting bracket and discard it safely.
6. Apply a thin film of clean engine oil to the
sealing gasket of the new filter.
7. Screw the new dry filter in place and tighten
an additional 3/4 to 1 turn by hand after the
gasket contacts the base.
After filter installation, operate the hand primer to
fill the fuel filters before attempting to start the
engine.
8. Screw the water cup into the filter casing.
1. Water Separating
Pre-Filter
2. Water Separator Bowl
3. Water-in-Fuel Sensor
Harness
4. Drain Assembly
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