- Clean the gun. See your gun manual.
- Increase fluid supply to proportioning pump:
- Use 2:1 or greater supply pump
- Use minimum 3/4 in. (19 mm) ID supply hose, as short as practical
- Fluid is too thick. Consult your material supplier for the recommended fluid temperature to maintain a viscosity of 250-1500 centipoise
- Clean inlet strainer screen.
- Worn pump inlet valve ball/seat or gasket. Replace pump.
- Remove return line and determine if flow is present while in SPRAY mode.