AH520 Tecumseh engine will not start; no spark to plug. Checked for spark to plug; no spark Cleaned fuel line from tank to carb. Used fresh fuel. Snowblower has not been used for about 15 years.

It might not have one. A fuel filter usually sits on the fuel line between the fuel tank and the carburettor. Check your oil level as well. Some engines have a low oil switch. If the oil level is too low, it will stop the engine.

Is fuel getting to the carb? Check the fuel line it may be plugged. The rubber deteriorates after many years and plugs up the line and or jets. Its always best to replace the fuel hose when you rebuild the carb. Have you checked for a spark at the plug?

replace your spark plug. it takes a Champion J19LM. If you left fuel in your tank over the winter then drain your tank and your float bowl. Add clean fresh fuel and it should go if not you need to clean your carb

no fuel flow to the carby
blocked tap , in tank filter or hose

it sounds like a fuel problem.
first drian fuel out of tank.
i know you have already cleaned the carby but dis assemble carby and clean with carby cleaner.
re assemble carby & fill tank with fresh fuel.
also clean air filter & check oil level & check spark plug,if the spark plug is black and the tip is blocked with oil build up, then replace.

Check the Spark Plug

YOU MAY NEED TO ADJUST THE FLOAT. IN THE CARB.THERE MAY BE "STUFF" IN THE FUEL BOWL THAT NEEDS TO GET CLEANED OUT.YOU MAY HAVE A FUEL LINE PINCHED OFF OR THE FUEL CAP VENT MAY BE PLUGGED.HOPE THIS HELPS.

plugged carb

metal or plasic float?

does it have an oil sentry switch on it? and if it has a fuel primer bulb on the side of the carburator,make sure it's not cracked.