Have a Wagner Paint Crew and it started out fine and then after a half hour or so, it gradually lost pressure to a small stream, I was using new paint and I cleaned the hose, screean, intake valve, and where the hose connects to, with no results

Paint Flow Problems

• If the unit does not draw material when the PRIME/SPRAY knob is set to PRIME, check to see if the paint hopper is empty. If paint is in the hopper, ensure that the paint is not too thick for the unit to draw. Also, make sure the unit is on level ground to allow the paint to flow properly in the hopper. Examine the inlet filter to see if it is clogged and clean it, if necessary.
  Sometimes the inlet or outlet valves may be stuck. If so, clean them. If this does not help, replace the valves. Check the PRIME/SPRAY valve to see if it is plugged and clear the valve, as needed.
  

• If the sprayer is drawing material properly, but the pressure drops when the trigger on the spray gun is activated, first examine the spray tip for clogging or wear. Clean the tip or replace it, if worn out. Also, check the inlet and outlet valve assemblies for clogging or wear. Clean the assemblies or replace them, if necessary. The paint may also be too thick or coarse to spray properly and may need to be remixed to a thinner consistency. The filter in the spray gun may also need to be cleaned.
  

Hello ald... use a fine piece of wire and clean the opening that the paint comes out through. It has a tendency to fill in as you spray. Joe