Stihl FS 490 C-M Instruction Manual - Page 10

English Installing the Threaded Fuel Filler Cap WARNING Unit vibrations can cause an improperly tightened fuel filler cap to loosen or come off and spill quantities of fuel. To reduce the risk of fuel spillage and fire, tighten the fuel filler cap by hand with as much force as possible. Damaged or Broken Cap If your fuel cap does not tighten properly, it may be damaged or broken. Stop using the power tool and take it to your authorized STIHL dealer for repair. Vapor Lock WARNING Vapor lock occurs when fuel in the fuel line or carburetor vaporizes, causing bubbles to block the free flow of liquid fuel into the carburetor. Vapor lock cannot be relieved or affected by opening the fuel tank. Removing the fuel filler cap without first allowing the power tool to cool adequately can result in fuel spraying. Always follow the instructions in this section when removing the fuel cap. To relieve vapor lock: - Press the manual fuel pump bulb at least 20 to 30 times - even if the bulb is already filled with fuel - to clear the vapor and send liquid fuel into the carburetor. Then start the power tool. For specific starting instructions, see the appropriate section of your instruction manual. - If the manual fuel pump bulb will not be filled, place the Choke Lever to the start position } and pull the starter cord until the engine runs. If the engine does not start after 10 pulls in the start position }, start the engine in the run position F. - If your power tool will not restart, or if vapor lock occurs again, the power tool is being used in conditions too extreme for the fuel being used. Discontinue use and let the engine cool completely before attempting to start the power tool. Before Operation Take off the transport guard and inspect the power tool for proper condition and operation. (See the maintenance chart near the end of the instruction manual.) WARNING Always check your power tool for proper condition and operation before starting, particularly the throttle trigger, throttle trigger lockout, momentary stop switch, cutting attachment, deflector and harness. The throttle trigger must move freely and always spring back to the idle position. Never attempt to modify the controls or safety devices. WARNING Check fuel system for leaks, especially the visible parts, e.g., filler cap, hose connections, manual fuel pump (only for power tools equipped with a manual fuel pump). Do not start the engine if there are leaks or damage - risk of fire. Have the power tool repaired by a STIHL servicing dealer before using it. WARNING Never operate your power tool if it is damaged, improperly adjusted or maintained, or not completely and securely assembled. WARNING Check that the spark plug boot is securely mounted on the spark plug - a loose boot may cause arcing that could ignite combustible fumes and cause a fire. WARNING Do not mount any cutting attachment to a unit without proper installation of all required parts. Failure to use the proper parts may cause the blade or head to fly off and seriously injure the operator or bystanders. WARNING The cutting attachment must be properly tightened and not damaged. Inspect for loose parts (nuts, screws, etc.) and for cracked or damaged heads or cracked, bent, warped or damaged blades. 8 FS 460 C-M, FS 460 C-M L, FS 490 C-M, FS 490 C-M L