168 5 HARD START AND NO START DIAGNOSTICS
Figure 196 Water drain valve
1. Water dra in valve
2. Plastic tube
3. Open water drain valve and collect a fuel s am ple
using a clear container. Check for the following
conditions:
• Fuel must be the correct grade, clean, and
undiluted.
• Gasoline, kerosene or other chemicals in the
diesel fuel
(If diesel fuel is contaminated, correct the
condition and retest.)
• If the fuel filter was not serviced or drained for
a long time, some sediment or water could be
in the fuel filter housing.
NOTE: Cold weather can cause fuel waxing in
some grades of diesel fuel. Waxing will restrict
or stop fuel flow through the fuel fi lter.
Figure 197 Fuel strainer drain valve
4. Open fuel strainer drain valve. Collect a fuel
sample using a clear container. If fuel is
contaminated do the following:
a. Pull drain valve down and out of bowl.
b. Remove strainer bowl and check strainer
for sediment, debris, or rust. Clean and
replace as required.
c. Check fuel tanks and fuel lines. Clean
and flush if necessary.
5. Prime fuel system . See “Priming the Fuel System”
in Section 4 (page 132) for procedure.
Possible Caus es
• Low fuel level in fuel tank.
• Inline fuel valve (if equipped) could be shut-off.
• Fuel supply line could be broken or crimped.
• The fuel tank pickup tube could be clogged or
cracked.
• Supplemental filters or water separators may be
plugged or leaking allowing air to enter the fuel
system.
• Failed seal for inlet fitting in fuel filter housing
• Water or contaminants in fuel tank
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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