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Nilfisk 125.3 losing pressure

Bought a nilfisk C 125.3 today, & followed instructions & watched youtube vids to see how to operate, tries it, but the pressure keeps dropping. The motor cuts out after about 1 minute and I get about 3 seconds of pressure before it drops to a dribble. what might I be I doing wrong? Do I need to 'prime' it somehow? Hope someone can advise. Robin

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