Didn't say to ground the DC source to the tank ground, would have to research that. In my view, AC or DC a tank can build up a static charge just as can just walking up to it on a really dry/cold day can do and I want that charge to go to ground via a path that doesn't include me or what I'm fueling but mostly I'm thinking grounding for lightning protection. I often see diesel fuel tanks like this on our project sites and the majority are grounded.I still don't get why you'd ground a DC system. The requirement to bond is exactly the same with or without. Grounding is an electric code thing. 120vac is grounded. Nothing I know that's 12 or 24vdc is.
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