Illustration 109 g00290109
8. Loosen the fuel line nuts at the valve cover base.
Loosen these line nuts one at a time.
9. Operate the priming pump until the flow of fuel
from the fuel line is continuous and the flow of fuel
is free of air bubbles.
10. Push in the plunger, and hand tighten the
plunger. If the engine does not have a fuel priming
pump, crank the engine.
11. Tighten each fuel line nut before you loosen the
next fuel line nut. Tighten the fuel line nuts to a
torque of 40 ± 7 N·m (30 ± 5 lb ft).
Continue this procedure until all of the fuel lines
have been cleared of any air. Before you start the
engine, make sure that the fuel line nuts are
properly tightened. Also make sure that the
priming is locked.
i05264163
Fuel System Primary Filter
(Water Separator) Element -
Replace
SMCS Code: 1260-510-FQ; 1263-510-FQ
Water in the fuel can cause the engine to run rough.
Water in the fuel may cause an electronic unit injector
to fail. If the fuel has been contaminated with water,
the element should be changed before the regularly
scheduled interval.
The primary filter/water separator also provides
filtration in order to help extend the life of the
secondary fuel filter. The element should be changed
regularly. Install a vacuum gauge. Change the
element for the primary filter/water separator if the
pressure is at 50 to 70 kPa (15 to 20 inches Hg).
Replace the Element
Fuel leaked or spilled onto hot surfaces or electri-
cal components can cause a fire. To help prevent
possible injury, turn the start switch off when
changing fuel filters or water separator elements.
Clean up fuel spills immediately.
Illustration 110 g03130076
(1) Bowl
(2) Element
(3) Drain
1. Stop the engine.
2. Turn the start switch to the “OFF” position.
3. Shut off the fuel tank supply valve to the engine.
4. If the primary fuel filter is equipped with a drain
valve, open the drain valve in order to drain any
fuel from the filter case. Close the drain valve.
NOTICE
Care must be taken to ensure that fluids are con-
tained during performance of inspection, mainte-
nance, testing, adjusting, and repair of the product.
Be prepared to collect the fluid with suitable contain-
ers before opening any compartment or disassem-
bling any component containing fluids.
Refer to Special Publication, NENG2500, “Cat Dealer
Service Tool Catalog” or refer to Special Publication,
PECJ0003, “Cat Shop Supplies and Tools Catalog”
for tools and supplies suitable to collect and contain
fluids on Cat products.
Dispose of all fluids according to local regulations
and mandates.
5. Remove the fuel filter bowl and wash the fuel filter
bowl with clean diesel fuel.
6. Remove the fuel filter.
128
SEBU7125-13
Maintenance Section
Fuel System Primary Filter (Water Separator) Element - Replace
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