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Mercury 4-STROKE User Manual

Mercury 4-STROKE
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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/start button 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.
Battery not fully charged.
Incorrect starting procedure. Refer to Operation section.
Old or contaminated fuel.
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. Check fuses, refer to Maintenance section.
Threaded connection of an air hose is loose.
Ignition system component failure.
Spark plugs fouled or defective. Refer to Maintenance section.
Engine Runs Erratically
POSSIBLE CAUSES
Low oil pressure. Check the 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.
TROUBLESHOOTING
100 eng

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Mercury 4-STROKE Specifications

General IconGeneral
Engine Type4-Stroke
Fuel TypeGasoline
Cooling SystemWater-cooled
Ignition SystemCDI (Capacitor Discharge Ignition)
StartingManual / Electric
Shaft Length15", 20", 25"
Max PowerVaries by model
Full Throttle RPM RangeVaries by model
Fuel Induction SystemEFI / Carbureted
SteeringRemote / Tiller
WeightVaries by model
Fuel Tank CapacityVaries by model, some models include external tank
Oil CapacityVaries by model

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