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Fuel rail pressure regulator


 

Hi group, I need a bit of help,
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Actually, on my Subaru/Vanagon conversion project, I am working around my EJ25-2011 fuel system. Here are my 2 questions :
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  1. I am tempt to buy and install an Automotive 13129 injection fuel by-pass pressure regulator. Did some of you have an opinion or experience to share on this regulator ? Is this a good choice for the EJ25 application ?
  2. On the right side of the engine (facing crank pulley), between cylinders the air intakes, there are two fuel rail tubings. The first one is obviously for the fuel line pressure quick connector. The second one is a plain straight tube made to receive a slip-on rubber line and a collar. Is this some sort of fuel rail vacuum line ? Could you explain the function of this tube ? What should I do with it ?
Thanks for your help,
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Bernard
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I have used a very similar version of a fuel pressure regulator with good luck.?
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Also as you thought one of the connection is for the fuel, the other is Evap.? top is fuel supply bottom if Evap?