fuel pump extra valve wha does it do?

1969 CHEVROLET CAMARO
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MICSTVHGGRD
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I have a 69 chevy camero 302 and i just bought a new fuel pump for it. The new pump has an extra valve on it that my 20 dollar one didn't. Can you tell me what that is for?
Jul 8, 2012 at 12:37 AM
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