Fuel System; Engine Fuel Filter - Manual Starting Models - Mercury 40 FourStroke Tiller Handle Operation Maintenance Warranty Installation Manual

2. Ensure the battery is secure against movement.
3. Battery cable terminals should be clean, tight, and correctly installed.
Positive to positive and negative to negative.
4. Ensure the battery is equipped with a nonconductive shield to prevent
accidental shorting of battery terminals.

Fuel System

Fuel is flammable and explosive. Ensure that the key switch is off and the
lanyard is positioned so that the engine cannot start. Do not smoke or allow
sources of spark or open flame in the area while servicing. Keep the work
area well ventilated and avoid prolonged exposure to vapors. Always check
for leaks before attempting to start the engine, and wipe up any spilled fuel
immediately.
Before servicing any part of the fuel system, stop engine and disconnect the
battery. Drain the fuel system completely. Use an approved container to collect
and store fuel. Wipe up any spillage immediately. Material used to contain
spillage must be disposed of in an approved receptacle. Any fuel system
service must be performed in a well ventilated area. Inspect any completed
service work for sign of fuel leakage.
FUEL LINE INSPECTION
Visually inspect the fuel line and primer bulb for cracks, swelling, leaks,
hardness, or other signs of deterioration or damage. If any of these conditions
are found, the fuel line or primer bulb must be replaced.
Engine Fuel Filter ‑ Manual Starting Models
Read the preceding fuel system servicing information and warning.
Inspect the fuel filter. If the filter appears to be contaminated, remove and
replace.
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MAINTENANCE
WARNING
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