8 DIAGNOSTIC TOOLS AND ACCESSORIES 565
Fuel Pressure Gauge
Figure 537 ZTSE4681
1. Quick disconnect check valve
2. Fu el test line
3. Fu el Pressure Ga uge
4. Inlin e shut-off valve
5. C lear test line
The Fuel Pressure Gauge is used to check for aerated
fuel at the fuel rail.
Slack Tube Manometer
Figure 538 ZTSE2217A
The Slack Tube Manometer is a U-shaped tube with
a scale mounted between the legs of the tube. When
the portability of the g auge bar tool is not required, this
manometer is used to measure low vacuum for intake
restriction or low press ure for crankcase.
Filling
Fill the manometer with water before checking
pressure. Use o n ly distilled water. Add some colored
water vegetable dye so the scale can be read more
easily. With both legs of the manometer open to
the atmosphere, fill the tube until the top of the fluid
column is near the zero mark on the scale. Shake the
tube to elimin ate a ny air bubbles.
Installing, Reading, and Cleaning
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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