There are only a few reasons, either the saw is running too rich on the carb settings ( i think you would know notice this due too poor engine performance ) or the air filter is blocked ( again this would effect engine performance ) or the the tank is leaking.
SOURCE: Fuel Mixture Husqvarna 455 Rancher Chain Saw
Page 17 of your Operator's Manual says 50:1.
Fuel/Oil Mixture
Lou
SOURCE: my 455 rancher won't maintain power. I have
If you have been running ethnol mix in your saw there is a good chance that your fuel vent line is plugged. Loosen your fuel cap and start saw on its side and see if it runs. If it does you will have to clean your fuel vent.
SOURCE: 455 rancher chainsaw does not pump oil to the chain
If you look under the machine by the chain you'll see a flat head screw (next to the sprocket) which controls the bar and chain oil flow . Try to turn the screw and check if there's any oil flow to the chain . If not you will need to replace the oil pump (part # 537 10 55-02 which will cost you about $35.00) Hope this help
SOURCE: magneto to flywheel gap for Husqvarna 455 Chain Saw
Ignition module gap
Place a business or index card between the fly wheel and coil, rotate until the magnetic attraction pulls everything tight together. Tighten the coil screws, rotate the flywheel until the attraction eases and remove the card. Ensure nothing contacts when flywheel is rotated.
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou
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