We have the black tip on and have pla...

chemical injectors are terribly designed, Flimsy to say the least. They all use a check valve (ball bearing) held agaunst a steel seat by a tiny spring. Yours is either stuckshut or rotted away from using bleach and not cleaning it well.Feel free to take it apart, clean, inspect and re assemble, If its a low cost machine like a troy bilt or any other that uses an aluminum pump your probably wasting your time. Use a hand sprayer like the one you use for weeds and have someone else spray the chemicals while you use the washer with water only