The most common cause of generator backfiring is a dirty air cleaner. Generator air cleaners are designed to trap dust and dirt that would otherwise get sucked into the engine. When this filter gets clogged, it can cause backfiring.

The second most common cause of generator backfiring is too much oil in the fuel tank. If there’s too much oil in the fuel tank, it can clog up your carburetor and make it nearly impossible for your engine to run smoothly.

If you notice that your generator has started backfiring while running, then the first thing you should do is check your air cleaner and make sure that it’s clean and clear of any obstructions. If cleaning doesn’t work, then you may need to replace your air filter altogether. You can usually find replacement filters at most auto parts stores or online retailers like Amazon or eBay (link).

Last modified: October 4, 2022