Troubleshooting; Engine Will Not Start; Engine Runs Erratically; Performance Loss - Mercury 2.5 Operation And Installation Manual

Engine Will Not Start

POSSIBLE CAUSES
• Incorrect starting procedure. Refer to Operation section.
• Old or contaminated gasoline.
•
Engine flooded. Refer to Operation section.
• Fuel is not reaching the engine.
a. Fuel tank is empty.
b. Fuel tank vent not open or restricted.
c. Fuel shut‑off valve closed
d. Fuel tank filter obstructed.
• Ignition system component failure.
• Spark plug fouled or defective. Refer to Maintenance section.
• Carburetor inlet needle stuck from contaminated gasoline.

Engine Runs Erratically

POSSIBLE CAUSES
•
Spark plug fouled or defective. Refer to Maintenance section.
• Fuel is being restricted to the engine.
a. Fuel tank vent not open or restricted.
b. Fuel tank filter obstructed.
• Ignition system component failure.

Performance Loss

POSSIBLE CAUSES
• Damaged or improper size propeller.
• Boat overloaded or load improperly distributed.
• Excessive water in bilge.
• Boat bottom is dirty or damaged.

TROUBLESHOOTING

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