Engine Runs Erratically; Performance Loss; Battery Will Not Hold Charge - Mercury 135 Verado Manual

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Engine Runs Erratically

POSSIBLE CAUSES
Overheating ‑ Warning horn not working.
Low oil pressure. Check oil level.
Spark plugs fouled or defective. Refer to Maintenance section.
Incorrect setup and adjustments.
Fuel is being restricted to the engine.
a. Engine fuel filter is obstructed. Refer to Maintenance
section.
b. Fuel tank filter obstructed.
c. Stuck anti‑siphon valve located on permanently built‑in
type fuel tanks.
d. Fuel line is kinked or pinched.
Fuel pump failure.
Ignition system component failure.

Performance Loss

POSSIBLE CAUSES
Overheating ‑ Warning horn not working.
Low oil pressure. Check oil level.
Throttle not opening fully.
Damaged propeller or improper propeller size.
Incorrect engine timing, adjustment, or setup.
Boat overloaded or load improperly distributed.
Excessive water in bilge.
Boat bottom is dirty or damaged.

Battery Will Not Hold Charge

POSSIBLE CAUSES
Battery connections are loose or corroded.
Low electrolyte level in battery.
Worn out or inefficient battery.
Excessive use of electrical accessories.
TROUBLESHOOTING
134

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