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Posted on Jan 02, 2017
You've hit the nail on the head.The float,needle and seat are stuck wide open.Once the carburetor bowl is full of fuel the float rises up on top which pushes the needle back into the seat shutting of the flow of fuel.As the engine consumes that fuel the float drops and opens the needle and seat filling the bowl and shutting off the fuel again.Things that cause this process to not work are:forgetting to empty or run out the fuel before storing it for the winter.Sediment buildup in the bowl.Mineral deposits in the needle and seat.
Not emptying out the carb can leave water in the bowl which freezes,crushing the float.It also promotes sediment buildup and mineral deposits.The float when crushed or cracked will not float,nor shut off fuel.Sediment takes away capacity of fuel in the bowl,very necessary for wide open throttle.Mineral deposits build up to the point that the needle and seat can't make a good seal so fuel will continue into the carburetor.
Enough information yet?
To repair,take the nut off the bottom of the carburetor bowl.There are the float and needle and seat assemblies.All three need to be replaced,$10 max.After you get the parts replace one piece at a time so you can see how they go together.Next replace the spark plug, engine oil and air cleaner.They are fuel fouled and even if you could get the engine started will only add more damage to your engine.BEFORE you put the new plug in cycle the engine by pulling the starting cord a few times to get rid of the excess fuel.When there's now more fuel in the cylinder replace the plug,filter and oil.
That's it!Take your time and you can do it just fine.Re-post if you have any more troubles.
Posted on Jan 13, 2010
SOURCE: Hi, My Dewalt 3100 pressure
The Dewalt 3100 came with 2 different pumps. The Blue Cat pump and the oil free pump that was made by DeWalt.
You may just have a bad Thermal relief Valve on the unit.
You can find the parts diagram at www.allpartsinc.com
Posted on Oct 01, 2011
"Protector Valve" could mean several different things. There is "pop-off" safety pressure relief valve and there is a "Thermal Relief Valve". Your pump could be protected with both, or only one of these. A pic would nail it down quickly.
Posted on Mar 15, 2012
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