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Mercury 305 CID - Poor Fuel Economy

Mercury 305 CID
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TROUBLESHOOTING - 1C-1390-823225--1 1096
Poor Fuel Economy
Cause Special Information
Fuel leaks
Operator habits Prolonged idling; slow acceleration; failure to cut
back on throttle once boat is on plane; boat
overloaded; uneven weight distribution
Engine laboring Bent, damaged, or wrong propeller. Water test
boat for proper operating RPM at wide-open-
throttle
Clogged flame arrestor
Engine compartment sealed too tight Not enough air for engine to run properly
Boat bottom Dirty (marine growth), hook, rocker
Carburetor Idle mixture settings, accelerator pump adjust-
ments,linkage binding, choke adjustment, carbu-
retor flooding over, main fuel jets
Improper fuel
Crankcase ventilation system not working
Engine needs tune-up
Engine running too cold or too hot
Plugged or restricted exhaust
Engine Low compression

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