u/Intelligent_Ad8830

I just purchased a Graco Project Painter Plus and attempted to use it to spray Sherwin Williams Woodscapes solid stain. Both a .515 and .519 caused the same experience. Pump would run and pressurize sprayer nicely for approx 30 seconds and then it would stop and a single stream would come out of the gun. Every time I attempted to re-prime, the same series of events would occur. It seems like the sprayer couldn't maintain pressure. Both tips and the sprayer were new and unused. Has anyone experienced this before? Tips? Thanks - Frustrated DIY'er