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Fuel system
What you should know about fuel.
Most of the fuel presently available in North Amer-
ica is oxygenated to some extent. This is commonly
done through the addition of ethanol. Most engines
offered for sale on outdoor power equipment in the
North American markets are designed to tolerate no
more than 10% ethanol by volume
Ethanol is hygroscopic, meaning it absorbs water.
If left exposed to air, it will draw water out of the air.
Ethanol is an oxygenator, which means that it will
oxidize (corrode) metal that it comes into contact with.
Exposure to air causes fuel to go bad quickly, leaving
gum and varnish deposits.
Fuel used in Cub Cadet outdoor power equipment
should be no more than 30 days old. Because it may
already have been stored at the refinery or gas station
for a week or more, fuel should be purchased in small
quantities and stored in safety approved gas cans with
the caps closed.
For storage, all fuel should be run out of the tank
and engine. Anti-oxidation additives will help keep the
fuel fresher.
Servicing the fuel system
Inspect the fuel system every time the tractor is
operated. If dirty or fuel that does not smell "right" is
found in the fuel tank, drain the fuel tank an replace the
fuel filter
Drain the fuel tank by removing the fuel line from
the fuel filter and drain the fuel into an empty safety
approved gas can. Dispose of the bad fuel in a safe,
responsible and legal manner.
Gasoline and it vapors are
! CAUTION
! CAUTION
extremely flammable. Use common
sense when working around the fuel
system.
Fuel filter
A dirty fuel filter can result in a lean run condition.
The fuel filter should be replaced every 100 hours.
To replace the fuel filter:
1.
Clamp off the fuel lines to prevent fuel from leak-
ing when the lines are disconnected.
See Figure 9.9.
Fuel filter
IMPORTANT: Take care that the fuel lines are
not damaged when clamping them off. Never
insert a screw or anything else into the fuel line
to prevent fuel from coming out. This will dam-
age the inside of the fuel line.
NOTE: There are commercially available fuel
line clamping tools that will not damage the fuel
lines.
2.
Squeeze the tabs on the fuel line clamps and
slide them away from the filter.
3.
Carefully slide the fuel lines off of the filter. If
there are pieces of rubber on the barbs of he fuel
filter, replace the affected fuel line.
IMPORTANT: The I-series tractor uses low per-
meation fuel line to meet EPA guidelines. When
replacing the fuel lines, they must be replaced
with the same type of low permeation fuel line.
4.
Install the new filter by following the above steps
in reverse order.
5.
Test run the engine and check for leaks before
returning to service.
161
MAINTENANCE INTERVALS
Figure 9.9
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