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Mercury 40 4-Stroke User Manual

Mercury 40 4-Stroke
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TROUBLESHOOTING
65
Starter Motor Will Not Crank The Engine (Electric Start Models)
POSSIBLE CAUSES
Blown 20 Amp fuse in the starting circuit (carburetor Models) or main power relay/accessories
circuit (EFI Models). 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
Guardian System activated. Refer to Features & Controls - Warning System.
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.
Fuel injection component failure (EFI Models).

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Mercury 40 4-Stroke Specifications

General IconGeneral
Engine Type4-Stroke
Horsepower40 hp
Cylinders3
Fuel Induction SystemElectronic Fuel Injection (EFI)
StartingElectric
Displacement747 cc
Shaft Length20 in
Dry Weight216 lbs
SteeringRemote
Alternator Amp18 amp / 226 watt
Full Throttle RPM5500 - 6000 RPM

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