Cub Cadet MTD P90 Series - Manual (Page 17)

Introduction
11
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.
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 engine 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. Dispose of bad fuel in a safe and legal manner.
Refer to the units service manual for the procedures to drain the fuel tank.
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: The part number for the fuel filter is BS - 298090S.
It is a 150 micron (red) filter. Use of a filter with a
lower micron rating will cause fuel starvation
issues.
1. Clamp off the fuel lines to prevent fuel from leaking
when the lines are disconnected. See Figure 1.9.
NOTE: 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 clamp-
ing 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 the fuel filter, replace
the affected fuel line.
IMPORTANT: The P90 series engines uses low permeation 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.
! CAUTION ! CAUTION
Gasoline and its vapors are extremely flammable. Use common sense when working around
the fuel system. Avoid sparks, open flames or heat sources that can ignite the fuel vapors.
Figure 1.9
Fuel filter