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Usually the 50's are gravity fed from the tank unless they are fuel injected instead of carb. There should be a petcock with 3 connections on it: 1 for fuel in, one for fuel out, and another for vacuum. If connected properly, it should allow fuel through when vacuum is applied. You can test by sucking n the vacuum line. If it doesn't work, then your petcock is bad and you need a new one.
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