Mercury 250 Specifications download pdf (Page 86)

TROUBLESHOOTING

Engine Runs Erratically

POSSIBLE CAUSES

• 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 on built in fuel tank.

d. Fuel line is kinked or pinched.

e. Injector plugged.

• Fuel pump failure.

• Ignition system component failure.

Performance Loss

POSSIBLE CAUSES

• Throttle not fully open.

• Damaged or improper size propeller.

• Incorrect engine timing, adjustments, 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.

• Defective rectifier, alternator, or voltage regulator.

• Open circuit in the alternator output wire (fused link).

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Mercury 250 Specifications Page 86