I found a document for you, but you may want to test the pressure regulator first.
(here is a video, there are many like that)
https://www.youtube.com/watch?v=aITQclp7zIE
I can't attach the document because it is too big, you can find it here
http://www.askatech.com/AskATechLive...Track/G083.pdf
have fun and good luck