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Old 03-24-2019, 11:49 PM
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Diseasel300 Diseasel300 is offline
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Join Date: May 2016
Location: Texas Hill Country
Posts: 5,783
If it sat open and exposed to the air for years then I'd suspect the delivery valve as the most likely culprit. Probably dried out and formed a ring of rust and/or sediment that's preventing it from seating. Pull the #3 DV holder and pull the DV and take a look. If that's all it is, you can probably just polish the seating faces and be back in business.
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