how to fix leak on karcher 3.67 1750 psi 1.5 gpm pressure washer?

The water inlet is where the water is leaking from. This is a 2 peice part. The leak is where the garden hose hooks to power washer. The water comes out from behind the threaded hose tightener piece that secures garden hose. tried silicone but only slowed leak, not sure if just needs new grommet. need advice before money is wasted. thank you in advance. Part # on piece is9.760-383.0