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Thanks JJ, I will try your suggestion.

Hi JJ, yup I've tried that, have waited for about 2-3 minutes with trigger depressed to see if that will prime it, but to no avail !! But thanks for that, I will try just about anything right now :roll:

Hi, can anyone help me resolve the lack of venturi effect on my Karcher K5.91, I have stripped the venturi valve down and re assembled it, checked the poly tubes for blockages and leaks, but it still does not draw any detergent from the reservoirs, the machine is new but no warranty exists.