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Poppet valve missing in gun

Does the pump need back pressure to activate

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Old models yes, new models no

Posted on May 15, 2014


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: Model CPW 1800 2 lance

Byronj25, you can get the internal part that has most likely failed here. You may want to dismantle it though and check that the black elbow tube has not failed also, as that part is obsolete and so would require a full new Lance. New Lance link

Posted on Jul 27, 2011

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SOURCE: washer seems to be locked up with pressure which is locking the flywheel. The gun trigger no longer releases the water pressure, and I don't know how to safely relieve the pressure. I

Your pressure washer is equipped with a "unloader valve". This is the device that routes the water into a by-pass loop when you release the trigger. Something has gone wrong inside causing the valve to not spring into the unload position. You can take it apart and see if you can discover what is going on. The most likely thing is that a bit of water still in it froze this winter and destroyed either replaceable seals or distorted the valve body (which is not repairable). On these little homeowner pressure washers, the best place to get parts is usually through the owners manual that came with it, or Karcher may have a web site set up for this. Also there is the possible resource of a pressure washer distibutor, which you would find in the yellow pages. They usually concentrate on commercial pressure washing equipment, but sometimes getting parts or pumps through them may be easier.

Posted on Feb 29, 2012

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What is a bypass unloader

According to
"The unloader valve diverts water flow into bypass when the trigger gun valve is closed. Unloaders may be designed to respond to either an increase in pressure or a change in flow. The unloader valve may also be used for variable pressure adjustment."

More information here:
All About Unloader Valves ePowerWash

Jun 06, 2014 | Alfred Karcher Pressure Washer

1 Answer

Poppet valve missing in gun

Not sure I understand. What is your model #.
pressure is created by forcing the water through the tiny hole in the spray nozzle. The gun is a simple open and close valve.

May 14, 2014 | Garden

1 Answer

020209 pressure washer has no pressure

Your water inlet may be stopped up. Whether this model only has a screened hose washer or a better filter, pay special attention to that. Be sure the pathway is free and clear.

Take each of poppet valves and while pushing (with a pencil or something) on the part that moves up and the spring pushes it back down - with magnification and lots of light, be sure there isn't a small piece of debris affecting one of those valves. Its easy to miss, so look very closely.

Next, remove the hose from the pump. We are by-passing the entire unit that includes pressure hose, trigger gun, lance, spray nozzle. If it seems to pump a lot of water out of the pump--then the problem is most likely the trigger gun is clogged or the pressure nozzle is clogged. Some trigger guns can be taken apart -- some, not so much. Same with nozzles.

I hope this helps you, Randell. If yes, please take a sec to rate me. Thanks!

Mar 23, 2012 | FAIP Garden

1 Answer

Gentlemen, My Comet AXD2527G has recently developed a leak. Water (and maybe a little oil) are dripping rather quickly from somewhere under the unit. I am also getting a substantial drop in pressure...

taking it that it is a compressor unit
water is from compression of the gas and the oil will be from the sump oil passing rings
nothing major at this point as all compressors do this
best is to drain water at the drain tap before using it each day
no the drop in pressure is n from insufficient air supply as available air is what makes pressure
That will mean that the reed valves / poppet valves in the compressor head/s are needing attention and these can be replaced if spares are available

Nov 18, 2017 | Comet GXD2527G Pressure Washer Pump

1 Answer

97 jimmy runs when you pour gas into throttle body, fuel pumps is putting out 55 to 56 psi. but will not pickup the gas from the injectors, fuel manifold psi is 55 to 56psi. 1997 4.3 vortec engine

If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.

This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.

The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.

A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.

I’m happy to assist further over the phone at

Oct 17, 2010 | 1997 GMC Jimmy

1 Answer

My tahoe willonly start in the morning if I prime carb & now not at all

The first thing you need to check is fuel pressure with a fuel pressure gauge. You need a minimum of 56 PSI (preferable a lot more) for the vehicle to start.

If fuel pressure is low than the pump is usually the problem.

The CPI injection has poppet valves that deliver the fuel to the back of the intake valves. The poppets require the minimum fuel pressure to open. If the pressure is off by less than a couple of pounds the poppets will not open.

Priming to get the vehicle started and then the vehicle continues to run is a classic symptom for this problem. Since the poppets are under vacuum with the engine running they require less pressure to open.

I’m happy to assist further over the phone at

Oct 01, 2010 | 1998 Chevrolet Tahoe

1 Answer

Back right tire seized up and won't turn

this problem is caused by the 4 wheel active (needs no input from driver to apply brakes) anti-lock brake hydraulic controller has a leaking high pressure poppet valve to that wheel, u will need to replace the control valve, they sell rebuilt units. This is a fairly common problem on active ABS systems with traction control.

Sep 30, 2010 | 2001 Cadillac DeVille

1 Answer

1996 gmc ck1500 4.3 liter fuel injector system. How does it work? The engine misses irradically when running and suspect fuel injectors are not working correctly. How can we varify that and what needs to...

Did you check for ignition miss first? Check spark plugs and see which ones are firing correctly and which ones aren't. Did this vehicle ever overheat in the past? If so, that could be the biggest problem right there. If it did overheat, the fuel lines under the intake manifold can melt resulting in cylinders not working properly.

The injection system sits under the intake manifold and it works by supply and demand. Piston goes down and that opens the poppet valve to let the fuel flow into the cylinder. When the piston goes back up, it closes the valve. 9 times out of 10, there's dirt in those poppet valves, which in turn makes the engine run rich with no control over the fuel.
Advise to check the fuel pressure regulator too.

Oct 12, 2009 | 2002 GMC Sierra C/K1500

2 Answers

My 1999 GMC Jimmy won't start without jumping it from another vehicle. This is when I do a cold start. The Battery is New! It will start without jumping once it is warmed up..

When the engine is cold, it takes a lot of current to crank the engine over and this pulls the voltage down that is available to the fuel pump. The GM vortec injectors have poppet valves that are pressure activated. If they do not get full pressure, they just don't open even if the injector solenoid valves are being fired. The combination of reduced voltage at the pump and dirty injectors or possibly a pump that is getting weak will prevent the engine from starting
Gm released a bulletin describing a special injector cleaner for this problem, it goes in the gas tank. The idea was to clean the poppet valves so that they opened a little more easily. You could ask your dealer about this, or just try dumping a couple bottles of generic injector cleaner in with a fill up. If this doesn't help, you may have to replace the fuel pump.

Apr 14, 2009 | GMC Jimmy Cars & Trucks

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