Starter Motor Will Not Crank The Engine (Electric Start Models); Engine Will Not Start; Engine Runs Erratically - Mercury 75 User Manual

Starter Motor Will Not Crank The Engine (Electric Start Models)

POSSIBLE CAUSES
• Blown 20 Amp fuse in the starting circuit. Refer to Maintenance section.
• 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 or starter 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.
a. Fuel tank is empty.
b. Fuel tank vent not open or restricted.
c. Fuel line is disconnected or kinked.
d. Primer bulb not squeezed.
e. Primer bulb check valve is faulty.
f. Fuel filter is obstructed. Refer to Maintenance section.
g. Fuel pump failure.
h. Fuel tank filter obstructed.
• Blown 20 Amp fuse (EFI Models). 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
• 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.
TROUBLESHOOTING
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