Indmar Premium 400, Operator'S Manual, Page: 23 / 124

2-1
© 2020 Indmar Marine Engines
Section Two
GENERAL INFORMATION
Before operating or maintaining the engine, review “Safety” on
page 1-1.
WARNING! Fuel is extremely flammable and explosive under
certain conditions.
When refueling, stop the engine. Close all
hatches and ports, and make sure all electrical components
are switched off. After fueling is complete, open the engine
compartment and inspect for fuel or vapors. Run the blower for at
least four minutes before starting the engine(s).
While it is always preferable to use fuel that does not contain
alcohol, all current Indmar engines are designed to operate on
E10 (10% maximum ethanol) fuel. Any fuel containing more than
10% ethanol is not only unacceptable to use but is also illegal
to use in a boat. Damage sustained from fuel with an alcohol
content greater than 10% WILL NOT be covered under the Indmar
Limited Warranty.
When fuel containing alcohol is exposed to water, the alcohol in
the fuel more readily mixes the water and actually creates a cloudy
layer of water/alcohol mixture in the bottom of the fuel tank and a
layer of gasoline on the top. Because the gasoline layer has had
some or all of the alcohol removed from it, the remaining fuel will
be of lower octane because alcohol in the fuel raises the octane.
Since fuel is pulled from the bottom of the tank, the first liquid that
the fuel pump is going to push into the engine’s fuel system is
going to be a mixture of alcohol and water that will not burn. There
are no chemical solutions that will reverse this condition. The tank
will have to be drained and the contents disposed of and the fuel
system, fuel lines, injectors, etc., will have to be flushed with clean
fuel to get the alcohol/water solution out of the system.
Our engines, except for the 460 Models and the Supercharged
575, are designed to run on mid-range (89 octane) fuel. The 460
and SC575 are designed to run on Premium (91-93 octane) fuel.
Using fuel with too low octane rating will reduce the performance
in the engine and may cause catastrophic engine damage that is
not covered by Indmar’s Limited Warranty. There are no substitutes
for the correct octane fuel. Octane booster chemicals that are
available at auto parts stores are not enough to raise 87 octane