Question about Dewalt DPD3100 Gas Pressure Washer

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Starts but does not keep running. checked oil & its full. do you need water pressure at the pump? I know it has a low oil pressure cut off.

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  • Dewalt Master
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First: check and change the spark plug and do a oil change (OIL IS NOT THE PROBLEM BUT IS GOOD TO DO IT) then do a test with fresh gasoline. Second:check all fuel components (LINES,CARB,ETC...) Third:if any of this fix the problem your machine need service.

Posted on Nov 10, 2010

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Posted on Jan 02, 2017

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1 Answer

How do I stop pump from running? Cistern connected pump does not seem to be pressurizing. Pump not cutting off, and getting hot.


Pump probably needs to be serviced. It probably pressurizes a tank and when that tank reaches a pressure the pump is turned off. But just guessing.

May 27, 2015 | Plumbing

1 Answer

I just installed new water pressure tank,it builds pressure to max then water runs low on pressure till pump kicks back on.whats wrong


Have to set the pressure switch
(instructions are under the cover)

65 # cut off
42 # cut in

Should install a new switch every ten years
& a new check valve before the tank & manifold
assy every 20 years

Oct 25, 2014 | Water Worker 44 Gallon Vertical Stand...

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My low oil light comes on while trying to crank my car and car stalls; will not start until I keep trying a couple of times. After it starts it runs fine and then shuts off after backfiring sometimes and...


LOW OIL PRESSURE WILL CAUSE OIL PRESSURE SWITCH OR SENDING UNIT TO DISABLE FUEL PUMP.CHECK FOR OIL PRESSURE.REMOVE OIL PRESSURE SENDING UNIT SCREW IN OIL PRESSURE GAUGE TESTER INTO BLOCK WHERE OIL PRESSURE SENDING UNIT GOES TURN ENGINE OVER CHECK FOR OIL PRESSURE SHOULD BE 18 PSI @ 2000 RPM. BESURE TO WRAP TEFLON PLUMBERS TAPE AROUND THREADS TO THE OIL GAUGE PRESSURE TESTER OIL WILL SPRAY EVERY WHERE.IF YOU ARE GETTING NO OIL PRESSURE.YOUR OIL PUMP FAULTY.YOUR ENGINE CRANKSHAFT BEARINGS WORN OUT.WORN DAMAGED CAMSHAFT OIL PUMP DRIVE GEAR OR OIL PUMP DRIVE ROD DAMAGED OR BROKEN. IF OIL PRESSURE OKAY OIL PRESSURE SENDING UNIT IS BAD.

Sep 28, 2011 | 1994 Chevrolet Caprice Classic

2 Answers

I have a 94 caprice classic that wil crank but it wont turn on. It just got a new ignition and key for it and it still is doing this problem. it says press key fault and low oil pressure then it shuts off....


You vehicle is equipt with a fail safe switch incase your oil pressure is low it shuts off the fuel pump, More likely your oil pressure switch will need to be replaced,its 2011 relace the oil pressure switch more likely the sensor itself has failed,(oil breaks plastic after awhile,) make sure you have motor oil in the crankcase check the level,

May 04, 2011 | 1994 Chevrolet Caprice Classic

2 Answers

My oil light is on and beeping like crazy on my 1997 volkswagon jetta and something in the motor keeps clicking on top of that i would like to know why?


Usually when the oil light comes on, its too late to save the engine if the sensor is working properly.

Check the oil in your engine under the hood. If it has the correct amount of oil, check the wire going to the oil pressure sensor located on the side of the engine. It may be loose or the sensor may have failed sending a false reading.

If you do not have oil in the engine " no oil pressure" you may have badly hurt the engine, and the noise you are hearing is the rocker arms begging for mercy.

Good luck! write back

Feb 09, 2011 | 1995 Volkswagen Jetta

1 Answer

On start up, the motor ran slow then popped the circuit. plugged it into a 20 amp circuit, it ran a little stronger then shut off without popping the circuit. Motor was hot, and after a short period the...


It sounds like the compressor is trying to start under load because there is a tightness in the pump itself or there is high pressure air in the line between the pump and tank There is a small valve that releases the pressure out of the main pipe that runs between the compressor and tank once the tank is full and the motor automatically cuts off. You know this valve is working by the sound of a short spurt if air being released when the motor cuts off. Releasing this pressure means that the motor is able to restart easily because there is no load. If the valve is not releasing this air, the compressor is trying to start under full load which the motor is not capable of doing, hence the slow running, overheating and popping of breakers due to a current overload as the motor tries to run up to normal peed. Motor burnout is possible if it keeps recurring.

This small release valve is attached to the Pressure control switch that switches the motor On & Off and usually has a small pipe going to it or is incorporated inside the Pressure Control Switch. If the valve appears to be working then it means that the Non-return valve on the input to the tank is not sealing properly and letting air back into the main pipe causing the compressor to start under load. Check both valves for correct operation and replace as necessary.

If all the air side checks out OK the check for low oil level and / or binding in the air pump main drive shaft.

Dec 11, 2010 | Craftsman 33 gal Air Compressor 6 hp...

2 Answers

Low oil pressure no start


CHECK ENGINE OIL LEVEL ON OIL DIP STICK.OIL LEVEL SHOULD BE ON FULL MARK IF NOT ADD OIL UNTIL YOU GET TO FULL MARK.IF OIL LEVEL OKAY.YOUR LOW OIL PROBLEM CAUSED BY WORN DAMAGED OIL PUMP OR WORN ENGINE CRANKSHAFT BEARINGS.IF OIL HAS NOT BEEN CHANGED A LONG TIME CHANGE OIL AND OIL FILTER NOT GUARANTEE TO FIX PROBLEM.BUT COULD BE MINOR THING.OIL FILTER COULD BE STOPPED UP.WEAKEN OIL FLOW BUT LIKE I SAID PROBLEM COULD BE OIL PUMP OR ENGINE BEARINGS.REMOVE OIL SENDING UNIT SCREW IN A OIL PRESSURE GAUGE.TURN ENGINE OVER SEVERAL REVOLUTIONS TO SEE IF OIL PRESSURE BUILD UP TO 40 LBS. SEE 40 - 60 PSI. 2000 RPM.IF NO OIL PUMP TO WEAK .IF OIL PRESSURE RISES WHEN TURN ENGINE OVER.I HAVE SEEN FAULTY OIL PRESSURE SENDING KEEP ENGINE FROM RUNNING BECAUSE OIL PRESSURE SENDING UNIT WILL DISABLE FUEL PUMP RELAY TO KEEP FROM DAMAGING THE ENGINE.

Sep 23, 2010 | 2003 Lincoln Navigator

2 Answers

Oil gauge keeps coming on, loss in oil pressure


low oil pressure,mainly its thin dirty oil, pump needs servicing/replacing,pressure release spring,weak

Jul 05, 2010 | 1999 Toyota Camry

1 Answer

Engine sounded noisy & scratchy when i drove to school oil light on. Got back to car after 10 mins everything came on (radio etc) but when i went to turn it over everything just cut out like dead...


after the vehicle cooled completely and all the oil drained down it showed half full? that would mean it was anywhere from 2 to 2.5 quarts low? unless you mean that it showed halfway up the full / safe area on the dipstick.

the oil light being on usually means low oil or low oil pressure, if the vehicle still doesn't try to start after it is completely cool then you might have a locked up engine or multiple problems, check the oil again now that it has been sitting awhile look for water in the oil also check for oil in the water.

check battery connections again, make sure they are tight, if lights and such work then try to get a jump from someone. even new batteries can go bad

I would definitely be worried about that oil light though.

good luck and I hope this helps.

Feb 22, 2010 | Toyota Previa Cars & Trucks

1 Answer

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


HELLO THERE:
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.

Sep 15, 2009 | Honda Garden

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