Fuel & Oil; Avoiding Fuel Flow Restrictions; Fuel Requirements; Gasoline Recommendations - Mercury 135 Optimax Manual

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FUEL & OIL
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AVOIDING FUEL FLOW RESTRICTIONS

IMPORTANT: Adding components to the fuel supply system as in filters,
valves, fillings, etc. may restrict the fuel flow and could cause engine
stalling at low speed, and/or a lean fuel condition at high RPM, that could
cause engine damage.
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FUEL ADDITIVES
To minimize carbon deposit buildup in the engine, we strongly recommend adding
Mercury or Quicksilver Quickleen Engine Treatment additive (or equivalent) to
your engine's fuel at each tank fill throughout the boating season. Use additive as
directed on container.
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FUEL REQUIREMENTS

Do not use pre-mixed gas and oil in this engine. Use a clean and fresh
recommended gasoline during engine break-in and after engine break-in.
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GASOLINE RECOMMENDATIONS

United States and Canada
Use a major brand of automotive unleaded gasoline with a minimum posted octane
rating of 87. Mid-grade automotive gasolines that contain fuel injector cleaner are
preferred for added internal engine cleanliness. Leaded gasoline is not
recommended.
International
Use a major brand of automotive unleaded gasoline with a minimum posted octane
rating of 90RON. Automotive gasolines that contain fuel injector cleaner are
preferred for added internal engine cleanliness. Leaded gasoline is not
recommended. In areas where unleaded gasoline is not available, spark plug life
will be substantially reduced and preignition/detonation damage to the engine may
result from excessive carbon deposits in the combustion chamber.
Alcohol in Gasoline
We do not recommend the use of gasoline which contains alcohol because of the
possible adverse effect the alcohol may have on the fuel system. In general, if only
gasoline containing alcohol is available, it must not contain more than 10% ethanol
or 5% methanol, and the addition of a Water Separating Fuel Filter is
recommended.
If gasoline containing alcohol is used or if you suspect the presence of alcohol in
your gasoline, increase your inspection of the fuel system, visually checking for
fuel leaks or abnormalities.
Gasoline containing alcohol may cause the following problems to your outboard
and fuel system:
•
Corrosion of metal parts.
•
Deterioration of elastomers and plastic parts.
•
Wear and damage of internal engine parts.
•
Starting and operating difficulties.
•
Vapor lock or fuel starvation.
Some of these adverse effects are due to the tendency of gasoline containing
alcohol to absorb moisture from the air, resulting in a phase of water and alcohol
which separates from the gasoline in the fuel tank.
The adverse effects of alcohol are more severe with methanol and are worse with
increasing content of alcohol.
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OIL RECOMMENDATION

Mercury or Quicksilver Optimax/DFI 2–Cycle engine oil is recommended for your
engine. If Optimax/DFI 2–Cycle engine oil is not available, we recommend using
Mercury or Quicksilver TC–W3 Premium Plus 2–Cycle Oil. Severe engine
damage may result from use of an inferior oil.
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FILLING REMOTE OIL TANK

1
Remove the filler cap and fill with the specified oil. Oil tank capacity is 3 gallons.
(11.5 liters). Replace filler cap and tighten securely.
IMPORTANT: Always make sure the oil tank caps are threaded on tight. An
air leak will prevent oil flow to the engine.

FILLING ENGINE MOUNTED OIL RESERVOIR TANK

Note: Filling this tank is only necessary if the oil level should ever drop and the low
oil warning system is activated.
2
Remove the top cowl. Loosen the fill cap on the engine oil reservoir tank. Run
the engine until all the air has been vented out of the oil reservoir tank and tank
is filled with oil. Re-tighten fill cap. Stop the engine and replace the top cowl.
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FILLING FUEL TANK

Avoid serious injury or death from a gasoline fire or explosion. Always
stop the engine and DO NOT smoke or allow open flames or sparks in the
area while filling fuel tanks.
Fill fuel tanks outdoors away from heat, sparks, and open flames.
Remove portable fuel tanks from boat to refill them.
Always stop engine before refilling tanks.
Do not completely fill the fuel tanks. Leave approximately 10% of the tank volume
unfilled. Fuel will expand in volume as its temperature rises and can leak under
pressure if the tank is completely filled.
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FEATURES & CONTROLS
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WARNING SYSTEM

Warning horn signals
When the key switch is turned to the ON position, the horn will turn on for a moment
as a test to tell you the horn is working.
The warning horn will emit either a continuous beep or intermittent short beeps.
This will alert the operator and help identify the following listed situations (see chart
below). For visual display of the specific engine functions and for additional engine
data, refer to SmartCraft Product information on Page 13.
Function Sound
Start up One Beep
Low Oil Reserve Four Beeps every 2
minutes
Water in Fuel Four Beeps every
2 minutes
Cooling System Continuous
Problem
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WARNING
Warning Horn
Description
Normal System Test
Oil level is low in the engine mounted
oil reservoir tank. Refill the engine
mounted oil reservoir tank along with
the remote oil tank. Refer to Fuel & Oil
Section.
Water in the water–separating fuel filter
reaches the full level. Water can be re-
moved from the filter. Refer to Mainte-
nance Section for filter removal.
Engine Guardian System is activated.
Power limit will vary with level of over-
heat. Shift outboard into neutral and
check for a steady stream of water
coming out of the water pump indicator
hole. If no water is coming out of the
water pump indicator hole or flow is in-
termittent, stop engine and check water
intake holes for obstruction.
90-10199R30