Hi Ted12 You don't hear any sound when you push the primer bulb so I wouldn't be worried about that. If you have spark, compression and fresh fuel it will run. If it doesn't then the diagnosis begins. Don't be tempted to keep pushing the primer as they flood easily. If the air filter housing cap is missing it is not a problem if it has been stored under cover but make sure the air intake is clear. If they are left outside rain or sprinkler water will run down the air snorkel into the engine which is not ideal. A word of warning about beginning to play with mowers, it's very similar to the coronavirus ( in your case Victavirus ) and once it takes hold is very difficult to contain. Start clearing out the shed now or start plans to get a larger one. Have fun wce