Chapter 5: Fuel; What Type Of Gasoline To Use - Indmar 5.7L Vortec Operator's Manual

WHAT TYPE OF GASOLINE TO USE

All carbureted and standard EFI engines run on unleaded
fuel of 89 octane or higher. The LS7 requires 91 octane
or higher. Indmar recommends purchasing fuel from a
supplier that advertises that the fuel meets "TOP TIER"
specifications. This fuel has additives and detergents that
will reduce the build-up of deposits in the engine.
The intention of the TOP TIER Detergent Gasoline stan-
dards is to create a winning situation for gasoline retail-
ers, engine manufacturers and boat operators. Currently,
many gasoline retailers provide fuels with lower-quality
additive packages that can build up deposits on fuel injec-
tors and on intake valves. Others can build up deposits in
combustion chambers and may lead to intake valve stick-
ing. These lower levels of additives can have negative
impacts on engine performance and vehicle responsive-
ness. For a current list of gasoline retailers supplying TOP
TIER gasoline, go to www.toptiergas.com and click on
RETAILERS.
Indmar Marine Engines
Chapter 5
FUEL
Gasoline vapors are highly flammable and
explosive.
• Never smoke while refueling. Keep sparks
and flames away from fuel.
• Only refuel in well ventilated area.
• Never overfill fuel tank.
• Stop engine before fueling.
• Swallowing or inhaling gasoline or fumes
is dangerous. Seek medical attention.
• Gasoline spills on your skin should be
washed immediately with soap and water.
If gasoline spills on clothing, change
clothing immediately.
* Avoid spilling gasoline. Clean spills with
dry cloth and dispose properly.
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