Fuel System Operational Checkout Procedure - Navistar N9 Diagnostic Manual

40 1 DIAGNOSTIC TROUBLESHOOTING PROCEDURES

8.0 - Fuel System Operational Checkout Procedure

Step 1 Perform preliminary operational checkout procedure.
Did you Perform 1.0 Preliminary Vehicle Operational Checkout Procedure (page 23)?
Step 2 Determine if engine has a fuel delivery problem.
Perform Fuel Delivery Pressure (FDP) Test (page 2273).
Is fuel pressure between 60 and 100 psi?
Step 3 Determine if engine has fuel in the engine oil.
Look for engine oil over full ¾ " or more and smells like fuel.
Is fuel in the engine oil?
Decision
Yes: Go to Step 2.
No: Go to 1.0 Preliminary
Vehicle Operational
Checkout Procedure (page
23).
Decision
Yes: Go to Step 3.
No: Go to 8.1 Fuel Delivery
Pressure (page 120).
Decision
Yes: Go to Fuel in Engine
Oil (page 124).
No: Review operator
complaint.