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Karcher k7.80 pressure washr

It seems to be leaking from the outlet hose and has lost pressure and keeps turning on and off HELP

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Re: karcher k7.80 pressure washr

I have a Karcher K 3.86 M electric PW with a similar problem: water leaks from the pump near the outlet and the pressure surges on and off continuously at intervals of 1-2 seconds. The leak appears to be coming from a very thin crack in the plastic pump head in what I think is the "unloader" valve portion. I read elsewhere that if you leave water in these PW's and it freezes it will crack, causing leaks. I don't know how you can empty all the water out so I think we must store these PW's in areas that won't freeze in winter.

Posted on Jul 16, 2008

Re: karcher k7.80 pressure washr

Throw it in the bin and get a proper make. By the sounds of it karcher is a crap make

Posted on Dec 28, 2007

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Karcher KB 499

Hi the pump surges when there is a leak on it find the leak that should sort your prob.
Hope this helps. Sean

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