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1972 Blazer K5 Fuel Tank question?

AZ72K5

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Joined
Sep 7, 2005
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Arizona
The stock fuel tank has three hose attachments on the filler side, one for the fuel, another for overflow, and a third smaller one 5/16" hose attachment.
My question is what is the 5/16" one used for and where does it run to?
I have all of my lines attached but have not been able to figure out what this one is for. :doah:
 

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