Will a bad fuel pump cause engine surge on lawn mower?

A bad fuel pump can contribute to engine surge on a lawn mower, but it's not the only possibility. A weak or failing fuel pump might not deliver fuel consistently, leading to fluctuations in engine power and resulting in surging. However, other issues like a clogged carburetor, dirty air filter, faulty governor, or problems with the ignition system can also cause surging. If the surge is severe or accompanied by other symptoms (like difficulty starting, lack of power, or sputtering), it's more likely to be a problem beyond just the fuel pump.