What should I do before starting the pressure washer?
Before starting, check your engine oil level as failure to do so may cause damage to the pump. Turn off the switch marked 'H' (ON/OFF) to the OFF position. Wipe up any fuel spills before starting the engine and refer to the engine manual for correct starting procedures.
From the official DeWalt 3300 Psi Pressure Washer manual, page 6
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