Troy-bilt spray gun leaks - Karcher 2500 PSI Pressure Washer

Inspect the seals, connections and hoses, and seals for any leaks. Leaks can lead to a drop in pressure and cause the pressure washer to shut off.

The typical reason to lose oil into the filer box, is that the engine has been tipped up, this allows engine oil to travel down the breather tube and into the back of the box, the other reasons are, engine worn, or the engine breather itself is faulty.

Bad pump

same problem here

most cases you need to get a new gun assembly

Your pressure relief valve may not be working. If that happens when you shut off your spray gun, then pump is dead heading, stopping the motor. If this is the case it stops dead, not coasting. Either replace the pressure adjusting relief valve or remove it, and disassemble it and clean it.

Remove the air filter and set aside.
Take a can of carburetor cleaner and spray the inside of the carburetor.
Let it set for a moment and then try starting the engine. It should run a few seconds. Repeat. When it starts squirt a small shot of cleaner in the carburetor to keep it running. That should remove the varnish the gas leaves as it evaporates over the winter.

If it still won't keep running then there is trash in the float bowl plugging the needle valve seat and the jets.

1) Turn off the gas or remove the gas line and plug it with a small screw or stick to keep it from leaking out of the gas tank.
2) Look on the bottom of the bowl for a nut .
3) Remove the nut and drop the float bowl.
4) Carefully remove the pin holding the float and needle valve assembly.
5) Take the carburetor cleaner with the straw it comes with and spray every hole in the carburetor to clean the jets . (up through the needle valve seat, down top of the carburetor , see a hole, spray it with the cleaner.)
6) Clean the float bowl.
7) Reassemble and make sure the gas isn't leaking and try to start it again.

A leaking gun will kill all the pressure. You may need to repair or replace the gun

The tines sometimes get frozen to the shaft. You might try penatrating oil and use a heat gun or hair dryer to heat to loosen.
Also tap wiht a hammer around shaft.

Turn Black cone shaped valve clockwise to increase pressure there will be a small +/- plus will increase and give you pressure.

TK U