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In most cases this is because you have a high pressure tip, the red, white, yellow or green tip, on the wand. The detergent system will only work if you have the black, soap tip on the wand. With a pressure tip on the wand, there is too much back pressure for the syphon system to work. If you are using the soap tip, check the feed tube for the detergent for blockage, especially at the pickup filter and where it attaches to the water line.
The only filters on a pressure washer are: Where the hose hooks up to the pump there is sometimes a washer with a screen inside it. The syphon hose usually has a fine filter on the end that drops into the detergent. If this question is related to your other post see my answer there.
The only filter on the detergent pickup is usually at the end of the hose you drop into the detergent. To clean the line and syphon attachment only requires a little pressurized air to blow out any debris that may be in the line. Make sure you are using the black, soap tip on the pressure gun when trying to use the detergent syphon system. If you are using any of the high pressure tips there will be too much back pressure in the line for the syphon to work.
Hydraulic oil? Is this a pressure washer? Pump should be half full of SAE20 or SAE30 non-detergent motor oil. Engine should have 10W30 motor oil.
If you have a pressure washer ... and not water is coming out end of gun: Take all hoses off machine. Look at incoming water hose connection. The should be a filter washer. Clean or replace filter washer. Hook up water and turn on water. Water should come out other side of pump. Turn on power washer and see if water coming out of pump is pressurized. Now hook up pressure hose without gun. Turn on pressure washer and see if water comes out of hose and is pressurized. Finally, the gun may be bad. We used to replace guns when they went bad.
Most detergent injectors work by the venturi system. That is that the detergent is drawn into the stream by the forward flow of the water thru a very narrow port after the water passes thru the pump. This system works best when the pressure at the tip of the wand is low. Trying using a very large tip to draw in and apply the detergent, then remove injector and rinse with high pressure. Not good for the pump but to apply soap reliably under high pressure the soap needs to be injected through the intake of the pump. enjoy