Cub Cadet MTD 70 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
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
directions on how to remove it.
1. Drain the fuel.
2. Gently pry up on the tab 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 1.10.
! 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 1.10
Fuel Filter
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.
! WARNING ! WARNING