There can be many symptoms of a bad inlet valve on your pump. The most common of which is difficulty priming your pump. Replace it with a new Graco quality inlet valve. Inlet valves are wear items and replacement is recommended for regular pump maintenance.
Applications:
Amspray 1700
Amspray 1900
Proforce PF33
SprayTECH 1720
SprayTECH 1920
Wagner 9170
Wagner 9190
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