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An engine (such as a nitro engine) becomes flooded when the cylinder contains too much fuel for the piston to complete it's compression cycle, and so the engine cannot be turned over.

An engine can become flooded in a number of ways:

  • During starting: if the throttle is open too much, the muffler is blocked, the mixture is extremely rich, or the glow plug is not heated enough.
  • During fuelling: if the tank is overfilled, fuel will run down the exhaust back pressure line and into the muffler, and from there potentially into the engine via the exhaust port.

Do not try to turn the engine over with a starter if the engine is flooded. Doing so can bend the con rod. Remove the glow plug, and then turn the engine over---fuel in the cylinder will then be blown out the glow plug hole.

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