Chapter 1: INTRODUCTION
6
Fuel
Gasolines currently on the market are not pure gas.
Today’s fuels have alcohol and other additives in them
to reduce emissions. The fuel make up can vary sea-
sonally and geographically.
Fuel with alcohol added to it is sometimes referred to
as “oxygenated fuel”. The extra oxygen carried by the
ethanol increases the oxidation of the fuel. This speeds
up the process that causes the fuel to go bad.
Excessive alcohol in fuel creates a lot of problems for
gasoline engines. One of the biggest problems is that
alcohol attracts and holds water. This corrodes the
metal components of the fuel system, especially the
carburetor. Alcohol also does not produce as much
heat as gasoline when burnt. This results in less power
for the engine.
A 10% alcohol mix (E10) is acceptable for MTD
engines. Anything higher than that will result in perfor-
mance issues.
NOTE: E85 and E20 fuels are not to be used in
any MTD engines.
1. Use clean, fresh fuel with a pump octane rating
of 87 or greater.
• Stale or out-of-date fuel is the leading cause of
hard starting issues.
• Pump octane ratings beyond 87 will not improve
engine performance.
Fuel filters
Dirty fuel can clog the carburetor and introduce abra-
sive materials into the engine. To help prevent that,
MTD engines are equipped with a fuel filter. The fuel fil-
ter is part of the fuel tank nipple. See Figure 1.5.
To replace the fuel filter:
NOTE: On snow blower engines, the engine
shroud must be removed to reach the fuel line.
Refer to Chapter 3: Air intake systems for direc
-
tions on how to remove it.
WARNING: To avoid personal injury or property
damage, use extreme care in handling gasoline.
Gasoline is extremely flammable and the vapors
are explosive. Serious personal injury can occur
when gasoline is spilled on yourself and/or your
clothes which can ignite. Wash your skin and
change clothes immediately.
1. Drain the fuel.
2. Gently pry up on the tap that holds the fuel line in
place.
3. Remove the fuel line.
4. Remove the fuel tank nipple using a 12 mm
wrench.
See Figure 1.6.
5. Install a new filter by following the above steps in
reverse order.
NOTE: Apply a small amount of releasable
thread locking compound such as Loctite® 242
(blue) and tighten the filter by hand and the an
additional 3/4 to 1 full turn to compress the gas
-
ket.
Figure 1.5
fuel filter
Figure 1.6
12 mm wrench
Fuel filter
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