While holding the carb upside down the float should be level
SOURCE: When I start my pressure washer on full choke it
You need to take the float bowl off the carb from the bottom . You haven't given a lot of information about who did what to the carburator but somebody must have screwed with the float pisition for this to be happening . The way all carburtors work is the same you have the float bowl and the floats and on top of the floats is a valve called the needle valve. Now the neddle valve is there to stop the flow of fuel into the float bowl when the engine is not in a high damand cycle for fuel like start up or ideal the choke shuts the air off and gives more fuel at start up .However when the engine is running and the float bowl is being filled by gravity feed from the gas tank the floats will move up do to the amount of fuel in the float bowl and should shut the fuel from the gas tank off to the float bowl until the engine can burn the fuel and drop the float level enough to make the neddle valve open again to supply more fuel for the engine to run correctly its a never ending cycle . You need to adjust the floats and likely clean the carburator don't mess with adjustments there mostly automatic when the engine is running
SOURCE: How can I repair my Briggs and stratton 6.5 intek
Fuel Starvation - Float Bowl Carburetor
1) remove air filter assembly
*be cautious of tearing the mounting gasket. If it does tear, you HAVE to replace it. It is part of the priming system
2) remove the float bowl fastener. This is the main jet
3) carefully remove the float bowl, the rubber o-ring/gasket will not be able to be used if it is removed, you WILL have to replace it
4) using a spray 'carb cleaner'
spray up thru the center of the carburetor
spray and clean the main jet with cleaner and 'tag' wire
(tag wire is very thin, and can be used to clean the hole in the center of the main jet)
5) clean any debris from inside the bowl or carb body
6) re-install bowl and center bolt, air filter assembly
*if you need gaskets, your Briggs dealer can supply. The kit is cheaper than individual gaskets, and all the parts needed to finish the above repair are in the kit.
I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae
SOURCE: 18hp twin cylinder Briggs & Stratton backfire
Check to see if the carb is clean, if so the anti diesel value could not be working. Apply 12 volts to value and see if it move's. If that works then you may what to check the fuel pump and see if it pumps. After you tried all that then you may have change the main jet size because these engines come with a small jet for the EPA.
SOURCE: i have an old briggs stratton 2001 power washer
Excell pressure washers used a series of numbers such as yours. I believe that that number will be for pump or pressure washer as a whole unit. Check Excell web site for a match. If you are looking for the engine model number check the fan shroud or valve cover or tag on engine itself. Good luck
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