134 4 ENGINE SYMPTOMS DIAGNOSTICS
Figure 163 Fuel Pressure Test Adapter
NOTE: If the engine is equipped with a Shrader valve,
use the Fuel Pressure Test Adapter.
Figure 164 Fuel/Oil Pressure Test C oupler
NOTE: If the engine is equipped with a diagnostic
coupling, adapt the Fuel/Oil Pressure Test Coupler to
the Fuel Pressure Gauge.
8. Install the Fuel Pressure Gauge with s hut-off valve
into the test port at the front of the intake manifold.
Run the discharge hose into a bucket.
9. Open the shut-off valve. Pump the fuel primer
pump knob until a steady stream of fuel fl ows out
of the clear hose.
• If fuel has air bubbles, go to “Aerated Fuel”
(page 104) in this section.
•Iffuelflows without air bubbles, close shut-off
valve. Do step 10.
10. Pump the fuel primer pump again to build
pressure in the system. Lock down the knob.
11. Start the engine.
12. If the engine does not start in 20 seconds, repeat
the priming procedure.
13. Once the engine starts, let it run for five to 10
seconds, then shut-off the engine. Turn the fuel
primer pump knob clockwise to lock in place.
14. Remove fuel pressure test fitting (if used)
and dispose of any fuel in correct container
clearly marked DIESEL FUEL according to local
regulations.
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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