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When I switch the nozzle to high pressure the engine cuts off. Can you tell me what's wrong

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  • Kelly
    Kelly Mar 22, 2011

    Hi and welcome to FixYa, I am Kelly. I need to know w few things to help you.

    1. Your pressure washer model number

    2. The Engine number on the Engine

    3. The brand name of the high pressure pump if you can locate it. Comet and AR are just 2 names that make pressure washer pumps.

    4. When you say the engine cuts off does it sound like it is coming under and extreme load or.. that it does not have enough gas?

    I can not give you a professional answer without the information above.


  • rjbunting Mar 23, 2011

    HI THE MODEL NUMBER IS 020337. I'm not sure of the engine number , but it is a briggs&stratton 6.75hp. The pump is a annovi reverberi. It sounds like it is coming under a extreme load. Hope this helps. Thanks



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Hi again and thanks for your response. If the engine is coming under an extreme load the unloader valve is stuck in place. Since the unloader valve is on the bottom of the pump it stays wet all the time and when in not in use the metal parts of the valve corrode as will the brass parts of the pump housing.
The unloader valve is on page B of this link: (Item A)

The following steps are hard to perform without causing havoc with your engine due to tipping so, what I am recommending is that you do NOT tip the engine to perform the following procedure without any dis-assembly of your unit at this time:
- IF you have a very short garden hose like the one that would go to a hose reel or a washing machine hose. Use that hose for this procedure over night. Connect the short hose reel or washer hose to the water supply connection of the pump and also connect the high pressure hose to the pump. Pour about 5 oz of regular engine oil into the water supply hose and tie the hose so that it is elevated (to retain oil in pump) Keep the high pressure hose elevated also so that the hose does not drain oil the oil you just added from the pump. After a few minutes with the engine ign. OFF pull the engine through 2 times. Let is sit over night. (What your trying to do is lubricate the seals and hopefully loosen the grip of any internal corrosion in the unloader valve area.)
The next day... after no more than 24 hours. Connect the short hose to a real water supply and start your pressure washer. once started do VERY short bursts with the wand trigger (1sec bursts rapidly). Your trying to force the unloader valve move and cycle normally in the pump housing. REMEMBER you added 5 oz of oil yesterday to the water system so be careful where you spray the first bit of stuff coming out of the wand nozzle. Keep up this 1 sec burst cycle going for 2 to 3 minutes or if begins to work normally your done and it is time to tidy up. .

If this did not work.... (it does about 85% of the time)
- You will have to remove the unloader valve and clean it.
Once removed try to get as much stuff off of the spring and o-rings as possible.
- Also you will need to clean the pump housing where the unloader valve installs.
- INSPECT all of the o-rings for cuts and again carefully wipe them clean so as not to damage them.
- BEFORE you reinstall the unloader valve you will need to lubricate the pump housing and the unloader valve with "White Grease" (Auto parts stores have small tubes of #105 white grease) Don't be afraid to use liberal amounts of white grease.
- Re-install the valve and test
This should bring your pressure washer back to normal again.

Let me know how things went.

Posted on Mar 23, 2011

  • Kelly
    Kelly Mar 23, 2011

    Hi again,

    I just took a short break and had a revelation that is nothing short of a keen sense of the obvious to me. Remove the high pressure nozzle and check for obstructions. inside the back of the nozzle before you perform the steps in my last post. I think your high pressure nozzle is clogged.




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3 Answers

Does not give a continous high pressure flow cuts in and out

that is sure signal of insufficient water supply!

try easy solution first:
make sure that your mains is fully open, that tap on whihc hose is hook up is fully open and hose is of "decent" diameter to allow sufficient flow.

if above solution do not work then you need to make another, more difficult arrangement:
prepare 20litres pressure tank with inlet connected to mains and outlet by short hose to power washer, fill it with water from mains, keep it under mains pressure and use karcher power washer normaly. this will solve water supply problem. twenty litres will last about 2min, because it is re-filled, under standard pressure therefore it will last about 3min...

third possibility is to stop washing...

if you find my advice helpfull, please do not hesitate to left the comment and vote for me, thanx!

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Doesnt build pressure up ,it just runs right without pressure does the compressor require being oiled?

Here is some troubleshooting tips for you and a web link for you ok this should help
best regards michael
Troubleshooting Your Pressure Washer troubleshooting_pressurewasher.jpg General points to check if a problem occurs
  • Are the engine and fuel switches in the “ON” position?
  • When troubleshooting, always check oil and gas levels.
  • The oil for the pump is a 30W non-detergent mineral oil. Do Not fill over halfway on the sight glass.
  • Is the water tap open?
  • Check the choke and throttle levers.
  • Is the correct nozzle in the lance? Is the nozzle plugged?
  • Only the black nozzle is for soaping at low pressure.
  • Is the water-inlet screen clogged?
  • Hold the gun trigger open while pull starting the engine.
  • Check for O-rings in the lance and quick couplers.
  • Has the unit tipped over? Close the fuel switch and keep pull starting the engine until the excess fuel is burnt up, then open the fuel valve and try again. Some engines will need to be primed every time they are started.
  • Make sure the engine is turned off after each use. It should not be left running without use for longer than 2 minutes as the pump can overheat.
Are you experiencing low pressure?
  • Is there an air leak?
  • Dirty pump valves?
  • Check for worn pump valves or broken valve springs.
  • Check for a worn out spray nozzle.
  • Check for leaks in your plumping or hoses.
  • Troubleshoot your nozzle, is it turned to the highest pressure setting?
  • Is the unloader improperly set?
  • Are the engine RPMs too low?
  • Check if your water supply is sufficient.
  • Check if your engine is getting enough power.
Trouble with high vibrations
  • Dirty pump valves?
  • Do you have a sufficient water supply?
  • Is there are in your water supply?
  • Is the inlet water filter clogged?
  • Clogged or damaged spray nozzle?
  • Make sure it has the correct fuel
  • Has the choke been left on after the engine has warmed up?
If the engine won’t start
  • When troubleshooting the engine, check if it's low on fuel or oil?
  • Worn or dirty spark plugs?
  • Is the switch in the off position?
  • Is the fuel valve in the off position?
  • Is the engine flooded from over choking?
  • When cold starting, was the engine properly choked?
If the starter is hard to pull
  • Low oil in the crankcase or pump assembly.
  • Oil or fuel in cylinders (hydro locked).
  • Pressure built up in the system, relieve this by squeezing the trigger.

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