Pump leak from outlet cap/plug

I had this problem on my GP pump, I talked to Russ at southside equipment since the machine was still under warranty, he sent me an upgraded washer that has a rubber or hard plastic in the inside, it was fixed in 2 minutes.

Here’s the old one I threw away, it was all messed up

Good to know, mine is doing the same thing. I live about 20 minutes from Southside.

Keep the old one and file it down. I keep it in the center console