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hfcm cover drain plug

  1. HFCM Cover Replacement Questions

    6.0L Problems Forum
    I need some advice with the HFCM in my 2005 F-250 4WD Diesel. I just replaced the fuel filter and tried to re-install the water separator drain plug. It looks good, but it will not tighten. It threads on loosely but keeps spinning. As I can't seat it, I assume it will pop out when driving...