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Which karcher unit do you have? I've tried priming both my k5.540's multiple different ways and they don't suck water from a standing source (bucket). If I fill a hose with water and hold the hose in the air both units will pull that water in, but only if it is being gravity fed. That is not how...

So my 2nd K5.540 arrived today and it also does not siphon water, it has 0 suction. This thing is a ridiculous piece of ####! I should have listened to this other guy on amazon: Amazon.com: N.Prince's review of Karcher X-Series featuring the Industry's ... Do NOT buy this unit if siphoning...

I have a new Karcher K5.540 that refuses to siphon water from a standing source (the only reason I bought it). How much suction are these things supposed to have? I've tried all of the suggestions here along with common sense and this thing has absolutely 0 suction. I tried calling karcher as...