Troubleshooting; Starter Motor Will Not Crank The Engine; Engine Will Not Start; Engine Runs Erratically - Mercury 150 Manual

Starter Motor Will Not Crank the Engine

POSSIBLE CAUSES
• Blown 20 amp fuse in the starting circuit. Refer to Maintenance.
• Outboard is not shifted to neutral position.
• Weak battery or battery connections are loose or corroded.
• Ignition key switch failure.
• Wiring or electrical connection faulty.
• Starter motor solenoid or slave solenoid failure.

Engine Will Not Start

POSSIBLE CAUSES
• Lanyard stop switch not in "RUN" position.
• Incorrect starting procedure. Refer to Operation section.
• Old or contaminated gasoline.
• Engine flooded. Refer to Operation section.
• Fuel is not reaching the engine.
• Fuel tank is empty.
• Fuel tank vent not open or restricted.
• Fuel line is disconnected or kinked.
• Primer bulb not squeezed.
• Primer bulb check valve is faulty.
• Fuel filter is obstructed. Refer to Maintenance section.
• Fuel pump failure.
• Fuel tank filter obstructed.
• Open 20 Amp fuse. Refer to Maintenance section.
• Ignition system component failure.
• Wiring or electrical connection faulty.
• Spark plugs fouled or defective. Refer to Maintenance section.

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.

TROUBLESHOOTING

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