Pressure build up in the water pump can make your pull rope hard to pull.
Use brute force and you are liable to break the pull rope or something else.
Release the pressure by pulling the trigger on the spray wand (do not point the wand at anyone) and you can now easily pull start the engine. Same thing when you are trying to change connectors, even when engine is off, you have to release the pressure in the nozzle by pulling the trigger on the spray gun.
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