Question about Karcher 2500 PSI Pressure Washer

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Pressure washer doesn't get up to high pressure

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What model of pressure washer? is it sucking out of a barrel or is it on mains water pressure.?
do you have detergent on this machine?

a bit more info will help a lot.

bit like ringing the garage and saying my car wont start, what do you think it is?

Posted on Jul 18, 2009

  • Israel Perez Feb 10, 2013

    pump is not puting out pressure?



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Posted on Jan 02, 2017


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Adjust the screw on the pressure regulator on the high pressure hose is one way The other is to check the nozzle for obstructions. The problem is that there is insufficient flow from the nozzle so the regulator valve is trying to cycle between cut off and working pressure.. The regulator is set at factory for a particular size nozzle and anything that alters that ratio will cause you problem. The screw on the regulator has some fine adjustment to allow for slight changes. Any impurities in the water supply will tend to block the nozzle affecting the regulator .

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In order to get the system to pick up whatever solution you have the pickup tube in, you have to use the black, soap tip on the spray wand. If you use any of the high pressure tips, usually red, yellow, white or green, there will be too much pressure in the line for the siphon system to work properly. There is no way to control how fast the system picks up the cleaning solution, so if it's using your solution too fast, dilute it with water in a five-gallon bucket so it doesn't go through your product so fast. After you use the soap tip to soak down whatever you're cleaning, switch to the appropriate pressure tip and rinse everything down.

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High likelyhood of your intake screen/filter being stopped up with debris that was in the water hose.

Other than that, more information would be needed. Like, does no pressure mean it doesn't seem to spray at all (or nothing more than the water hose is pushing water through the system with the engine off)? Or does the pressure come up a little and there is a pulse you can feel in the hose/trigger gun? Any other little details you notice can provide clues as to the root of the problem.

If it was just a stopped up intake, and this fixes your problem -- please take a sec to rate me. Thanks!

Mar 24, 2012 | Honda Black Max 2600 PSI Pressure Washer

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I can't get the machine to siphon the cleaning solution.

This is usually caused by either a plugged siphon line or if you are using the high pressure tips (red, yellow, white or green) on the wand. Check that the siphon line doesn't have any debris or bugs in it. The only way the siphon hose will work is if you use the low pressure, black soap tip on the end of the wand. The other tips cause too much back pressure for the cleaning solutions to be picked up by the hose.

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Troy bilt pressure washer will not build or reach high pressure

check the non-return valves in the pump block. if these are damaged or dirty you pressure will be greatly reduced. they are located behind the 3 lage brass hexagonal caps.

I hope this helps

Sep 04, 2009 | Karcher 2500 PSI Pressure Washer

2 Answers

B302 - unable to start detergent flowing - How should it work?

It will only pick up detergent if you use a low pressure detergent nozzle - or no nozzle at all. It also takes a while for the detergent to get to the nozzle.

Oct 18, 2007 | Karcher 2500 PSI Pressure Washer

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