MerCruiser 305 CID (5.0L) Service Manual page 622

SERVICE MANUAL NUMBER 24
Poor Fuel Economy Symptom (Continued)
Step
10
11
12
Index
90-861327--1 OCTOBER 1999
Action
1. Check exhaust system for possible restric-
tion.
2. Inspect exhaust system for damaged or
collapsed pipes.
Was a problem found?
1. Check for excessive resistance on the bot-
tom of the boat such as dirt, barnacles, etc.
2. Check for proper propeller size and pitch
for that application.
Was a problem found?
1. Review all diagnostic procedures within
this table.
2. When all procedures have been completed
and no malfunctions are found, review/in-
spect the following:
• Visual/physical inspection.
• Scan tool data.
• All connections within a suspected circuit
and/or system.
Was a problem found?
FUEL INJECTION SYSTEM TROUBLESHOOTING
Yes
PROCEED TO
OBD
OBD
OBD
No
Step 11
Step 12
Contact
MerCruiser
Customer
Service
Page 5F-21