First off sir you know your stuff and are good at explaining it. Thank you
I’m not sure how to tell the difference between the vacuum and hydro boost but from what I researched it and sounds like the vacuum has the bigger round piece with the diaphragm? I wasn’t able to check my truck today but I came across a picture I took when I was changing the spark plugs. Maybe you can tell, to me it looks like vacuum?
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Also I haven’t noticed anything leaking but I will go over it and look for leaks. I’m my opinion the truck has been pretty well taken care of as I bought it from original owner.