Cub Cadet ST 100 Operation Manual - Page 15

Fuel Filter Service The fuel filter cannot be cleaned and must be replaced once a year or every 100 operating hours; more often if run with old gasoline. 1. Remove all fuel from tank by running engine until it stops from lack of fuel. 2. Remove hose clamp from fuel line and remove fuel line from tank outlet. See Figure 6-8. Storage CAUTION: Failure to use a fuel stabilizing additive such as STA-BIL® or completely run the engine until it's out of fuel before off-season storage may result in damage to your engine's carburetor. Subsequent damage would not be covered under the manufacturer's warranty. Gasoline that will be stored longer than 30 days needs to be pre-treated upon purchase with fuel stabilizer such as STA-BIL® to prevent gum and varnish from forming in the engines fuel and intake system. Improper fuel storage can result in hard starting, no starting, stalling and poor performance. If the gasoline in your engine deteriorates during storage, you may need to have the carburetor, and other fuel system components, serviced or replaced. 1. Remove all fuel from tank by running engine until it stops from lack of fuel. WARNING: Never leave engine unattended while running. Fuel Filter Figure 6-8 3. Pull out old fuel filter from tank outlet. Replace when dirty or damaged. 4. Grasp new fuel filter from shouldered end and insert it completely to the shoulder into the tank outlet. See Figure 6-8 inset. 5. Replace fuel line and c-clamp. Clean Engine If the engine has been running, allow it to cool for at least half an hour before cleaning. Periodically remove dirt build-up from engine. Clean finger guard and around muffler. Clean with a brush or compressed air. IMPORTANT: Do not spray engine with water to clean because water could contaminate fuel. Using a garden hose or pressure washing equipment can also force water into the air cleaner or muffler opening. Water in the air cleaner will soak the paper element, and water that passes through the element or muffler can enter the cylinder, causing damage. WARNING: Accumulation of debris around muffler could cause a fire. Inspect and clean before every use. 2. Change oil. See Oil Change section. 3. Remove spark plug and pour about 1/2 an ounce of engine oil into cylinder. Replace spark plug and crank slowly to distribute oil. 4. Clean debris from around engine, under finger guard, and under, around and behind muffler. Touch up any damaged paint, and coat other areas that may rust with a light film of oil. 5. Store in a clean, dry and well ventilated area away from any appliance that operates with a flame or pilot light, such as a furnace, water heater, or clothes dryer. Also avoid any area with a spark producing electric motor, or where power tools are operated. 6. If possible, also avoid storage areas with high humidity, because that promotes rust and corrosion. 7. Keep the engine level in storage. Tilting can cause fuel or oil leakage. Removing From Storage 1. Check your engine as described in the Pre-Operation Check section of this manual. 2. If the fuel was drained during storage preparation, fill the tank with fresh gasoline. If you keep a container of gasoline for refueling, make certain it contains only fresh fuel. Gasoline oxidizes and deteriorates over time, causing hard starting. 3. If the cylinder was coated with oil during storage preparation, the engine will smoke briefly at startup. This is normal. Section 6 - Maintenance 15