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Either the pressure tip or wand are blocked or the valve in the trigger is broken. Remove the high pressure tip and either try another tip or pull the trigger without a tip on the wand to see if you have the same problem. If available, try another pressure gun on the hose.
The chemical injection system works by siphon action. You must have the black or largest/ low pressure tip installed for it to work properly. If you feel any pressure at the wand, most likely will not work. If your wand has the adjustable type tip, it may have a restriction causing pressure and not allowing siphon action. If you continue having trouble with siphon, you could plug/shut of siphon and install an aftermarket injector between the wand and the pump (not expensive). Sold at www.pwmall.com Good luck
This part should be available from the manufacture, have you check their website. It is normal when you turn the water on for a small string of water to come out the gun when you press the trigger even when the engine is not running.
Use a high quality carb cleaner poured directly into the gas tank and use a liberal (large) amount.Run the engine as long as you can with the choke on full or half full in order to get the carb cleaner into the carb.Then turn the engine off and let it sit for two or three days so that the carb cleaner can do its thing. While this is going on, why not do the below as well to improve water pressure.With the engine turned off, pour liquid TSP into the fresh water inlet until it comes out the other end at first just water that is already within the pump will come out but make sure you put enough TSP that it starts to come out the wand outlet. Then, let it sit for 48 hours and don't run it at all. This is how I fixed my no pressure problem firstname.lastname@example.org owner of Honda 5.5 with Comet pressure washer pump