looks to me like you have a leak from the hose to gun connection. remove the hose and see what's wrong. could be a damaged oring, bad sealing surface, or if its NPT it may just be loose. I am curious is that 4500psi hose? That looks like the same hose we use for 4500psi air. I'd bet a nickel that when you remove that hose there is a 011 oring. Replace that and you should be golden.
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