Different machines produce higher/lower levels of output pressure, so the obvious and practical answer is to - buy a better machine. I bought a 150bar PW on Ebay for £25+delivery. My second thought is, are you LOSING pressure on the output side of your machine?? Are you seeing any leaks at all because if so you might need to replace a few rubber seal O-Rings, they cost pennies and that alone might help. Third thought is - are your machines' engines/motors worn out? Again. low pressure could mean the motor is burned. PW's are so cheap now that I wouldnt even bother dismantling to clean/replace motor brushes, I'd replace and start afresh. All these are valid solution ideas. I hope one of them helps you resolve your difficulty. One final thing; believe it or not Ive just had to switch off my street pavement Mains stopcock yesterday; If the tap is left partway closed it will cut down your Mains Pressure to the house. Check that too. Maybe a mains tap either inside the house or out in the street hasnt been fully opened up again after plumbing repairs were last done.
Sally, July 2009