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37 L510001-05
FUEL REQUIREMENTS - 9
GASOLINE REQUIREMENTS
WARRANTY NOTICE: Damage caused to the engine
through the use of improper gasoline, low-quality or
gasoline with an octane rating below the minimum
requirements listed below, is considered misuse of the
engine. Such damage is not covered by the Crusader
Marine Engines warranty.
The ignition timing set by the factory requires the use
of a high-quality lead-free regular gasoline with the
following octane specifi cation.
Pump Octane Number (R+M/2) (PUMP) - 87
Figure 9-1 Fuel Requirements
UN
LE
ADED
REGU
LAR
UNLEADED
87
$
MINIMUM OCTANE RATING
R + M/2 METHOD
87
NOTICE: Most Crusader Fuel Injected engines are
calibrated to operate on 87 octane fuel and maximum
performance is obtained when using this fuel. Some
applications may require a higher octane fuel. These
particular applications will be noted.
If a slight pinging is heard during acceleration and the
proper octane fuel is being used, it is considered normal.
If a constant, heavy knock occurs, the engine should
be evaluated by a Crusader Marine Engines service
technician.
GASOLINE CONTAINING ALCOHOL
Gasoline containing alcohol, either ethanol (ethyl
alcohol) or methanol (methyl alcohol) is not
recommended for use in your engine. Gasoline
containing alcohol will attract and hold moisture and may
cause the following:
• Hard starting and operating diffi culties (vapor
lock, low speed stalling)
• Corrosion of metal parts
• Excessive wear and damage to internal engine
parts
• Fuel permeation through fl exible fuel lines
• Deterioration of some nonmetallic materials
The adverse effects of alcohol are more severe with
methanol and are worse with increasing alcohol content.
If gasoline containing alcohol is used, or if the presence
of alcohol is uncertain, more frequent inspections of the
complete fuel system are required. Any sign of fuel
leakage or deterioration must be repaired immediately
before further engine operation.
CAUTION
Fire and Explosion Hazard - Gasoline is extremely
fl ammable and highly explosive, and , if ignited,
can cause serious bodily injury or death. Careful
inspection of the entire fuel system including, but
not limited to, fuel tanks, fuel lines, fuel fi lters and
all fi ttings is mandatory, especially after periods of
storage. Replace any component that shows signs of
leakage, corrosion, deterioration, swelling, hardening
or softening.
NOTICE: Some gasolines contain an octane-enhancing
additive called methylcyclopentadlenyl manganese
tricarbonyl (MMT), and they should not be used.
These fuels may reduce spark plug life, and engine
performance may be effected.