Valve cover breather

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Joel Chapman

Joel Chapman

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Mountain Home, ID/ Hughson, CA
So since I’m redoing the intake and carb on my 71 318 I have decided to try to swap out the breather with the hoses on my passenger side valve cover. It has one line that went to the old carb that is no longer needed on the new carb. One line that went to the air filter that I was told would be fine to delete as long as I still put an breather on the valve cover. Lastly it has a line that runs back to my fuel tank. If I have a vented fuel cap could I cap that line at the fuel tank and not need to hook that line back up? If I need to I need to and will just trying to see what I can get rid of.

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Joel Chapman said:
So since I’m redoing the intake and carb on my 71 318 I have decided to try to swap out the breather with the hoses on my passenger side valve cover. It has one line that went to the old carb that is no longer needed on the new carb. One line that went to the air filter that I was told would be fine to delete as long as I still put an breather on the valve cover. Lastly it has a line that runs back to my fuel tank. If I have a vented fuel cap could I cap that line at the fuel tank and not need to hook that line back up? If I need to I need to and will just trying to see what I can get rid of.

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67Dart273 said:
I'VE ARGUED ABOUT THIS MANY TIMES PLEASE DO NOT RUN A VENTED CAP unless you "like" gas running down your fender. The 1/4 line in the newer cars with evap controls IS THE VENT. Either run the line up front "up high" so it won't siphon, and maybe plumb it into the air filter bonnet, or modify your filler tube to mimick the 69/ earlier vent which is easy, simple, AND DOES NOT leak **** all over the paint

More info

Fuel tank venting??

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I hope @67Dart273 doesn't mind my quoting him here, but it bears repeating.
 
as 67dart273's pic from the service manual shows in the other thread, your car has a tank vent system, and it needs a place to vent to. my opinion, you are better off keeping what you have
 
you need to keep the hose from the breather cap to the air cleaner. It's part of the PCV/crankcase evacuation system and should be retained.
 
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