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The fuel fill neck should be grounded separately from the tank ground. Both should be well grounded to the battery.
I also have an 8"x3" bronze grounding plate on my hull which provides over 12 square feet of grounding surface area in contact with the seawater. Since my zincs, motor, and electronics are also grounded to this plate, it really helps eliminate any electrolysis from happening apart from the zincs.
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Please re-think this statment.. 8" x 3" is not 12 sqft of area.. Filler neck should not be grounded to the battery it should be tied into the bonding system, tank should be grounded.
No 12volt grounds should be put to any bonding system. Only frame grounds that are not used as 12 volt grounds should be added to your bonding system( ie antenna gounds or IG grounds)
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I think he 's right. I was told that the plate is very porus which allows water penetration and that provides the high water to plate surface area. I'm with you on the bonding guidelines but I didn't ground my filler neck. If it's not in contact with any other metal , sea water or the electrical system , why bond it? Where would the static electricity or corrosion come from? If it's a fire risk I'll bond it but i don't see a hole for any terminal connection. Neck is screwed to the gunnel..Guess I'll have to through bolt it and bond it to that.
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That 3" x 8" grounding plate is made up of little bits of bronze each about the size of a BB, all fused to gether and looks like a fine cell sponge. If you add up the total surface area of the BB like bits it is easily 24 sq. ft. of surface area and is a great grounding point. By connecting your egine, fuel tank, etc. to it you dissipate any voltage potential and that is a good thing, especially from an electrolysis stand point. HOWEVER, there are a few fine points you should be aware of and they are better explained in Nigel Calder's book that has been often mentioned on the forum. Furthermore, I , for one, am sorely inadequate to confidently list here so check the book or other reliable source.
07-20-2009, 11:13 PM
Re: ? about bonding fuel tanks
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