DPD3300 Commercial Pressure Washer

When pressure washer is first started it seems to run great and has pressure but after 5 minutes or so it losses pressure and almost needs to get built back up.
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Reasons Why a Pressure Washer is Not Working Properly

Well, there can be a lot happening within the parts of a pressure washer but some of the most common causes why it starts and dies are issues related to spark arrestor, fuel filter, fuel cap, carburetor, and clogging of the pressure washer filter.

Using an old, worn-out nozzle is a common cause of lost pressure, and also has one of the simplest fixes. All you need to do is replace the nozzle and make sure you`re using the proper size. Don`t go by the color of the nozzle, make sure you check the orifice size.
A dirty inlet or discharge valve is the most common cause of a pulsating pressure washer. Dirt or hard water can get caught up in these little divots. It is important that you clean out these pieces every so often to prevent these kinds of problems.
How Do I Tell If My Unloader Valve is Bad? In most occurrences, the first symptom of an unloader valve going bad is no pressure from the wand when the trigger is pressed. This happens when the unloader valve gets stuck open and does not allow water to enter the hose and trigger.
If your hose is 100 feet or less, no, your hose will not likely have issues. However, if you want to use a hose that is a few hundred feet long, you will lose a noticeable amount of water pressure. Most pressure washers are not sold with long hoses because the best pressure is achieved from a shorter hose.
Give Your Pressure Washer a Break

No matter how powerful your pressure washer might be, it`s never a good idea to leave your machine running for too long because doing so will increase the risk that it will overheat. Instead, most professionals suggest using a pressure washer in intervals of three to five minutes.

Some of the most common faults that will make your washer stop mid cycle include thermostat failure, problems filling up with water for the rinse cycle, or even pump problems that prevent your washer from draining. One thing that you can check yourself is the lid switch.
Low water pressure in a kitchen faucet is often fixed by cleaning the aerator and changing the cartridge. Sediment buildup is common in all faucets, so they should be maintained regularly. Reduced water pressure in kitchen faucets is common due to sediment clogging the aerator or problems with the faucet`s cartridge.
Usually, well water pulsates when there isn`t enough air pressure in the tank. The two parts that regulate this pressure are the electric pressure switch and the internal air bladder inside the water tank. If either of them is malfunctioning, this can cause the water from your taps to pulsate rather than flow steadily.
Unloader valve failure — Power lags also result from failed unloader valves. This problem can be diagnosed by manually enacting the valve function. Open the tank and drain out the air and water, then close and power back up. If the compressor bogs down once again, the valve needs to be replaced.
Symptoms of a Failing Check Valve

For example, failing check valves will start to vibrate and even lose some internal parts when problems begin to arise. Other symptoms of check valve failure include reverse flow and excessive component wear and damage. Check valves will also emit noises as they start to break down.

For example, a 100-foot, 1” hose delivering 100 CFM at 90 psi will result in a 3.35 psi pressure drop. If that same hose is tripled to 300 feet, the pressure drop is 10.1 psi, which means the air is now pressurized to only 80 psi.
When using a portable pressure washer, there is no need for any more than 100 feet of hose. With proper set up of the portable machine, you can easily get 200 feet of coverage because you are using two different hoses collectively. You could easily add an additional 50 foot spare hose for larger projects.
For this reason you should not let your pressure washer idle, not spraying water for more than a few minutes. Without cooling the pump head the temperature will begin to climb to 200+ degrees. When it gets that hot, water seals and o-rings soften and wear quickly. Valves can be distorted and warp.
It Can Harm The Unit

Without water to cool and lubricate it, the pump will work harder than it should, causing it to wear down quickly. This can happen even with just a few seconds of running the pressure washer without the water being turned on. However, the pump is not the only part that takes damage.

A clogged carburetor is most commonly caused by leaving fuel in the pressure washer for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and cause the engine to run stall.
DON`T Let the Machine Run Too Long Without Pulling the Trigger. Pressure washers operate under pressure, and that pressure needs to be released by pulling the trigger. If you let the machine run for two minutes or longer without spraying water, then you could damage the pump.
A pressure washer unloader valve diverts the water flow through the bypass when the trigger on the gun is depressed. The Unloader valve is designed to respond to an increase in pressure or a change in water flow. The unloader valve can also be used for adjusting the pressure of your machine.
If a washer stops mid-cycle, it could be because the pump or the motor that runs it has failed. When this happens, it cannot remove the water efficiently, pump water in, and thus the sensors won`t allow it to move to the next cycle.
Why are washing machine cycles so long? If you`ve ever found yourself frustrated at waiting hours for your clothes to finish washing you`ve probably wondered why washing machines take so long these days. Put simply, it`s down to water efficiency – modern machines, particularly front loaders, are very water efficient.
Depending on the details of your situation, a sudden drop in water pressure could indicate any of the following issues: Faulty plumbing fixture. Faulty hot water heater. Leaking/blocked water supply pipe.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

<!– from fixya rte –>How do I set the pressure? – Dewalt 3800 PSI Pressure Washer
ANSWER : There is an adjust screw on the pump.most pressure are set for the high setting from the factory

How do you bypass the cut off switch – Dewalt 3800 PSI Pressure Washer
ANSWER : Connect the white and black wire together

I have a Dewalt DPD3100, 2 yrs old, never had any problem, water supply hose is attached, water is going in but no water out?
ANSWER : Take the hose off the gun and see if water comes out. If so the gun has to be taken apart and cleaned. Also where the water hose goes in to the machine there is a screen filter which you might have to clean if water is not comming out on the gun side. Use a screwdriver and pry it out carefully around the edges Clean the screen with a wire brush and put it back in and try it.

My dewalt dpd3300 ,why is it getting gas in the oil
ANSWER : This happens when the gas needle valve in the carburator sticks open. With it open, gas continues to flow into the carburator then into the cylinder and finally down into the crankcase. It can be caused by dirt in the needle valve’s seat, a stuck needle or float. Most of the time you can remove the float bowl and flush out any dirt. If there’s a lot you should consider flushing the gas tank and check your gas can for dirt. If the washer has been sitting for a long time the problem could be varnish is gumming up the carb works. Carb cleaner works well to flush that out. If the float, needle or seat is damaged you’ll have to rebuild or replace the carb.

New pressure washer runs starts and runs for 30-45 minutes with no problems then dies and will not restart. Once it cools for a few minutes it will restart but will die again quickly. If it is allowed to sit for 30+ minutes it will run for another half hour but then dies again. Changed oil, gas, checked all obvious areas. Any suggestions?
ANSWER : Try removing the carb bowl and check for dirt/water etc , also if the machine is over heating it may be getting vapour locked

1750 psi Electric Pressure Washer: My pressure washer is losing pressure and is pulsa…
ANSWER : If the pressure washer is pulsating then that is a sign of check valve failure. You may be able to clean of replace the check valves. Replacing the head is the wrong way to go. This is completely unnecessary. If you can tell me the model number of your pressure washer then I can assist you better in pointing you in the right direction.

Need help in getting Honda engine on NorthStar pressure washer to run.
ANSWER : Could be low water pressure I have found.Also, I purchased a can of “stuff” at Lowes today which allows you to circulate a liquid substance which lubricates the pressure pump….the pump could be frozen up…I have a rotating nozzle which I bought…and it had frozen up…this stuff works

Starts great and sprays great, but will not continue to run when [ stop spraying. It locks up until I release the pressure from the gun.is there a pressure by-pass adjustment I can make?
ANSWER : Tune up motor, replace air filter/spark plug and oil.