If a 3 kW generator fails to start, how long must you wait before attempting another crank?

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When a generator doesn’t start on the first crank, take a brief pause before retrying to protect the starting system and give things a chance to recover. Cranking draws a lot of current from the battery and puts the starter motor under heat. If you keep cranking without a break, the starter can overheat and voltage can sag, making the next attempt less effective. A short rest allows the starter to cool, the battery to recover some voltage, and the fuel system to settle so the next combustion attempt has a better chance to catch.

About 15 seconds is a practical balance: it’s long enough for cooldown and system stabilization, but short enough not to waste time. Waiting only a few seconds (like 5) may not give enough recovery, while much longer rests (30 or 60 seconds) don’t meaningfully improve odds and simply delay operation.