After I shut off my truck I get a pressure sound like it is leaking from my power steering pump. I took it for a drive and found that it is either the engine leaking or the power steering pump. I just installed a new engine and while I had the engine out I replaced the pressure side hose on the power steering. The level was low and when I went to shut truck off it hissed like air was coming out then when I went to pull the cap off to check the level it hissed a little again. I sprayed everything off and checked underneath while it ran to see if the front seal was leaking and was not and watched the power steering pump to see if it was leaking and was not. Any ideas as to where or what it is would be great!!