Fuel Pump Vent?

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d3fiant1

d3fiant1

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I'm unfamiliar with this third port on my mechanical fuel pump. I'm assuming is a vent from the pump to the crankcase filter. My question is, is this hose necessary? The original aircleaner assembly is long gone so I was planning in using an aftermarket crankcase filter, but I'm not sure if I should cap this "vent". Any Ideas?
 

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That 3rd nipple is just open to the crank case, thus making it a crankcase vent going into the breather there. It's no necessary with a breather already in the valve cover and of course a functioning PCV system.
 
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