[gwrightson]

I have recently noticed a drop in pressure both on my gauge and at the wand , although not dramatic yet it is becoming worse,
This afternoon I ruled out pressure relief valve problems ( I think ) stripping it down cleaning and replacing all o rings, not any better   .
My next guess would be the pump ,although lots of pressure before the valve s opened ,the pump is am interpump ww141 3cylinder.
Do any body know if a seal/repair kit  available? as Im guessing this is my next option before buying a replacement pump.
I have checked all filters etc that may be restricting flow.

Any suggestions or idea's appreciated

Geoff 

[Mike Halliday]

Geoff ask the pressure washer guys on the general cleaning section. They will know.

 but here is a good place to start

http://www.dualpumps.co.uk/groups/INTKITS__Interpump_Service_Kits

[Paul Moss]

Geoff, think you will find the problem is your supply pump.

[Mike Halliday]

Paul , Geoff has an old hurcules from Woodbridge , it is gravity fed so doesn't have a supply pump or water-box.

But I think you are on the right lines , the HP pump is being starved of water, maybe a blocked inline filter

[John Kelly]

Yep my guess would be that as well. Is there not a gauze filter within the water inlet. Also check/renew any hose connections, hose for air leaks. The pump will pull air far easier than water so even an tiny leak can have a major effect on the amount of water reaching the pump.

[gwrightson]

I have checked the gauze filter on the pump, I don't think their are any more filters .

I will check connections later today John, it is a possibility .

Geoff