The fuel system components on your Mercury Marine engine will withstand up to 10% alcohol content in the gasoline. We do
not know what percentage your boat's fuel system will withstand. Contact your boat manufacturer for specific recommendations
on the boat's fuel system components (fuel tanks, fuel lines, and fittings). Be aware that gasolines containing alcohol may
cause increased:
• Corrosion of metal parts
• Deterioration of rubber or plastic parts
• Fuel permeation through rubber fuel lines
• Starting and operating difficulties
!
WARNING
Fuel leakage is a fire or explosion hazard, which can cause serious injury or death. Periodically inspect all fuel system
components for leaks, softening, hardening, swelling, or corrosion, particularly after storage. Any sign of leakage or
deterioration requires replacement before further engine operation.
Because of possible adverse effects of alcohol in gasoline, only alcohol‑free gasoline should be used. If only fuel containing
alcohol is available, or if the presence of alcohol is unknown, increased inspection frequency for leaks and abnormalities is
required.
IMPORTANT: When operating a Mercury Marine engine on gasoline containing alcohol, storage of gasoline in the fuel tank for
long periods should be avoided. Long periods of storage, common to boats, create unique problems. In cars, alcohol‑blend
fuels normally are consumed before they can absorb enough moisture to cause problems. Conversely, boats may not be used
for days, weeks, or months, long enough for phase separation to take place. In addition, internal corrosion may take place
during storage if alcohol has washed protective oil films from internal components.
IMPORTANT: Mercury MerCruiser strongly recommends that this service should be performed by an authorized Mercury
MerCruiser dealer. Damage caused by freezing temperatures is not covered by the Mercury MerCruiser Limited Warranty.
NOTICE
Water trapped in the seawater section of the cooling system can cause corrosion or freeze damage. Drain the seawater
section of the cooling system immediately after operation or before any length of storage in freezing temperatures. If the boat
is in the water, keep the seacock closed until restarting the engine to prevent water from flowing back into the cooling system.
If the boat is not fitted with a seacock, leave the water inlet hose disconnected and plugged.
NOTE: As a precautionary measure, attach a tag to the key switch or steering wheel of the boat reminding the operator to open
the seacock or unplug and reconnect the water inlet hose before starting the engine.
IMPORTANT: Mercury MerCruiser requires that propylene glycol antifreeze, mixed to the manufacturer's instructions, be used
in the seawater section of the cooling system for freezing temperatures or extended storage. Ensure that the propylene glycol
antifreeze contains a rust inhibitor and is recommended for use in marine engines. Be certain to follow the propylene glycol
manufacturer's recommendations.
Preparing Power Package for Storage—MPI Models
Multipoint fuel injection (MPI) systems must have a special mix of fuel, stabilizer, and lubricant, completely fill the fuel delivery
system. This fuel mix stabilizes the fuel and lubricates the fuel pumps, fuel pressure regulator, fuel injectors and, reduces
internal oxidation of the fuel system metal components.
IMPORTANT: This special fuel mix can be used on Mercury Marine catalyzed gasoline engines.
Special Fuel Mix
!
WARNING
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.
!
WARNING
Fuel vapors trapped in the engine compartment may be an irritant, cause difficulty breathing, or may ignite resulting in a fire
or explosion. Always ventilate the engine compartment before servicing the power package.
1. Fill a 23 liter (6 US gal) remote fuel tank with 19 L (5 US gal) regular unleaded 87 octane (90 RON) gasoline.
2. Pour into the remote fuel tank 1.89 L (2 US qt) of Premium Plus 2‑Cycle TC‑W3 Outboard Oil and 29.5 ml (1 oz) of
Mercury Quickstor Fuel Stabilizer.
Section 5 - Storage
Page 96 90-8M0128973 eng MAY 2017
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