Section 03: FUEL SYSTEM
PA1553
5
FIGURE 3: FUEL FILTER/WATER SEPARATOR 03025
4. Lubricate O-ring with clean diesel fuel or
motor oil and place it in bowl groove.
5. Screw new filter element onto bowl snugly
by hand.
CAUTION
Do not use tool to tighten. Tighten by hand
only.
6. Lubricate filter seal with clean diesel fuel or
motor oil.
CAUTION
If the water separator continuously requires
draining, it is possible that water or sediment
has accumulated in the fuel tank. To correct
this situation, open the drain plug under the
tank when the fuel gauge indicates tank is 1/4
full in order to drain any contaminant.
7. Fill filter element/bowl assembly with clean
diesel fuel and attach onto cover. Hand
tighten an additional 1/3 to 1/2 turn after
making full seal contact.
8. Open valves of the engine fuel supply line.
9. Run the engine and check for leaks.
4.2 FUEL FILTER SERVICING (PRIMARY AND
SECONDARY)
The primary and secondary fuel filters are
located on the R.H. side of the engine. The
primary filter is located below the starter, and the
secondary fuel filter is below the air compressor.
They are of a spin-on type and must be replaced
every 12,500 miles (20 000 km) or once a year,
whichever comes first. The primary fuel filter is
equipped with a positive seal drain-valve to
prevent water infiltration in engine fuel system.
To drain, loosen positive seal drain-valve below
filter and tighten after water has been flushed
out.
A method of determining when filters are
clogged to the extent that they should be
changed is based on the fuel pressure at the
cylinder head fuel inlet fitting and the inlet
restriction at the fuel pump. In a clean system,
the maximum pump-inlet restriction should not
exceed 6 inches of mercury (20.3 kPa) and must
not exceed 12 inches of mercury (41 kPa) with a
dirty system.
At normal operating speeds and with the
standard 0.080" restriction fittings, the fuel
pressure at the cylinder head inlet is 50-75 psi
(345-577 kPa). Change the fuel filters whenever
the inlet restriction at the fuel pump reaches 12
inches of mercury (42 kPa) at normal operating
speeds. Also, change whenever the fuel
pressure at the cylinder head inlet fitting falls to
the minimum fuel pressure given above.
Change the filter cartridge(s) as follows:
NOTE
Use a suitable band wrench or filter wrench,
such as J22775, to remove the filters.
1. Stop engine, shut off the engine fuel supply
line valves (for valve location, See "3. FUEL
VALVES"). Unscrew and discard filters.
2. Fill new filter replacement cartridge(s) with
clean fuel oil, about two thirds (2/3). Apply a
thin coat of clean fuel oil on gasket.
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