On the differential vent: As far as I remember it is a metal gravity cap vent. Order another one. Take the cap off of the OEM that is already installed, thus leaving just a hollow pipe. Attach a piece of fuel hose to that pipe. Run the hose up as high as you can get it. I have mine terminating all the way up next to the fuel tank, just below the trunk. Install the new vent at the end of the hose. Make sure the cap is standing vertical, so that the gravity cap is free to move up and down.
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