Fuel System; Servicing The Fuel System; Fuel Filter - Cub Cadet RZT-S Professional Shop Manual

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RZT-S

Fuel system

What you should know about fuel.
Most of the fuel presently available in North America 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. Expo-
sure to air causes fuel to go bad quickly, leaving gum and varnish deposits.
Methanol is another type of alcohol that is used to oxygenate fuel. Fuel that contains 5% methanol can be used
as long as it also contains cosolvents and corrosion inhibitors to protect the fuel system. Fuel with more than 5%
methanol will cause starting and/or performance problem. It will also cause damage to the metal, rubber and plastic
components of the fuel system.
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 mower is operated. If dirty fuel is found in the fuel tank or fuel that does not
smell "right", drain the fuel tank and 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 extremely flammable. Use common sense when working around
! CAUTION ! CAUTION
the fuel system. Avoid sparks, open flames or heat sources that can ignite the fuel vapors.

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:
NOTE: Only use the OEM fuel filter, part number
KH-25-050-22-S1. See Figure 8.9.
1. Clamp off the fuel lines to prevent fuel from leaking
when the lines are disconnected.
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
damage 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.
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Fuel filter
Figure 8.9