Yes, vacuuming can kill fleas. The suction will remove the adult fleas as well as the eggs and larvae. You should also dispose of the vacuum bag immediately after use to prevent any fleas from escaping and coming back into your home. You can also treat your carpets with a flea-killing product before vacuuming, which will help to eradicate any remaining fleas. Be sure to read the instructions carefully and follow all safety precautions.

It's possible that vacuuming can kill fleas, but it's not a highly effective method. The best way to get rid of fleas is to use a product specifically designed to kill them. Vacuuming can help remove some of the eggs and larvae, which will help reduce the population, but it's not a guaranteed way to get rid of them all.