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fill tube
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  1. 2020+ LM2 Duramax Powertrain
    I’m installing an auxiliary tank with a gravity feed to the fill tube. I’m pretty sure the fill tube is 1 3/4” however I’m trying to confirm that before I order it. I have a 2020 3500 long bed DRW. It looks like GM changed the fill tube for the 2020. Can someone confirm or give me the...
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