Question about Dewalt 3800 PSI Pressure Washer

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My unit will start to pulsate/surge then completely shut off.

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Possible that there is dirt accumulation on the pressure washer.
1.check if the lines are clogged?
2. Check the gun open and blow air.
3. check the power switch .
4. check line to motor and if safety/load switch is acting due to overload caused by accumulation of dirt.
So clean up and check again.

Posted on Aug 26, 2010

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Posted on Jan 02, 2017

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Own a dc59 it surges dyson said need new filter. They sent one. Put it in vac still surges

Hello, this is Ava with Think Crucial.

There are a number of reasons why your Dyson cleaner is pulsating off and on. First, it maybe due to a battery of the unit. Make sure that the power cable is properly plug to the power and seated properly from the unit while charging. If you find that the battery isn't charging at all, you may need to replace the battery. Second is to check the MAX button of your cleaner. If the button lights up and flashes when your Dyson keeps on pulsating, press and hold the power button and depress the MAX button to turn off the function. You may need to do it for a few times to get the hang of it. Third is to check for any blockages or clogs in the attachments. Look down through the tube and check to see if there are clogs on the sweeper end or if the roller is tangled up in fibers. Clean the roller brush are if it it's necessary. You may need to empty the dust bin of your unit as debris can build up in hard to reach places. Lastly, cleaning the filters may fix the pulsating of your cleaner. Remove the filter and rinse it with cold water and air dry it for 12 hours. Don't use detergent when washing your filters. If the pulsating doesn't go with the given quick fix, I suggest to contact Dyson for further assistance on this.

You can purchase a wide variety of high quality Dyson replacement parts for your Dyson vacuum direct from Think Crucial with free shipping and an exclusive 10% coupon for readers, use code: FIXYA10

I hope this was helpful.

Ava B.
Think Crucial Customer Care

Nov 28, 2016 | Dyson Vacuums

1 Answer

JD Lx289 Surging at full revs, and full accelleration. Grinding noise and accellerator pedel vibrating/pulsating. more common when machine is warm.

When it is at full throttle start pulling the choke on slowly and see if it smoothes out and stops surging.if it doe,s you have a carb problem.this means it is getting too much will have too rebuild or replace carb.

Dec 09, 2010 | John Deere 22HP Hydrostatic 42" Riding...

1 Answer

When I brake the car surges. Feels like disks are warped but has recently had new brakes. This started surging about 8 months after the brakes were replaced. Could it be the fuel pressure regulator??

If the vehicle only surges when braking sounds like you have a brake pulsation. If the brakes have become overheated like when driving down a mountain this can warp the brake rotors. They will need to be machined or replaced.

Sep 12, 2010 | 2003 Chevrolet TrailBlazer

2 Answers

Pulsating when idle

The motor doesn't pulsate when you are spraying and pulsattes when not spraying is normal otherwise the pressure will just keep building and burn out the pump. However, if you are not using the sprayer right away then the unit should be shut off until your ready to start again.
I hope the answer is helpful, please rate if the answer has helped in any way. Good Luck and have a great weekend.

Apr 03, 2010 | Karcher K 3.98 M Electric Pressure Washer

1 Answer


IF yes then this is normal because the unit is slow to shut off when you turn the key to the start position since there is a surge in amps. from your alternator and starter working at the same time the power surge causes the unit to shut off/ reset its self. this is just to protect the unit it is just to protect the unit.

Mar 02, 2010 | Pioneer AVIC-F900BT Car GPS Receiver

1 Answer

Pulsating idle

Sometimes on the HT4100 Cadillac motors the timing would slip out of sync and that's where those idle surges would come in , as far as the transmission just go with a better synthetic automatic transmission oil like AMSOIL if this doesn't work your torque converter in some cases the flywheel might need to be replaced and might be lop-sided or cracked. These parts can easily be found at your local pick-a-part or salvage yard. GOODLUCK!!

Mar 06, 2009 | 1985 Cadillac Eldorado

1 Answer

On/of button

Check the fuse on the ups

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