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    Fuel System Bonding

    I am replacing the factory installed Dahl primary fuel filters with Racors. I have wires connected to the filter housings that go to the bonding system. The filters are mounted on plywood on the front engine bulkhead and are isolated by rubber fuel lines. I have not seen filters connected to the bonding system before. I was planning on removing this wiring- Am I missing something? It does not appear to be factory installed wiring. Maybe the PO was confused? Anyone else have this on their primary filters?
    Gibraltar, Mi.
    1986- 3870- Hino 175's - Just purchased May ,2017
    34' Tollycraft- sold
    88 26' Shamrock/ Diesel
    14' Zodiac Bay Runner

    #2
    I am guessing that the fuel is a conductor even though the hose is not.
    Tony Bacon,
    Washougal, WA
    Caspian
    1997 3788 Twin Cummins 250hp

    Comment


      #3
      Sounds like a belt and suspenders approach to me. Diesel isn’t an electrolyte to my knowledge, therefore, protecting dissimilar metals isn’t an issue. Sorry Mrs. Dennis, although I remember more from you chemistry class than I thought I would, I’m sure I missed that part.
      P/C Pete
      Edmonds Yacht Club (Commodore 1993)
      1988 3818 "GLAUBEN”
      Hino EH700 175 Onan MDKD Genset
      1980 Encounter Sunbridge "Misty Blue" (Sold)
      MMSI 367770440
      1972 Chevrolet Nova Frame off Resto-mod in the garage
      Boating on the Salish Sea since 1948

      Comment


        #4
        ABYC H-33-6 states that metal deck filling components must be bonded. There is no mention of bonding being required for diesel fuel filter housings
        Stan
        2001 Bayliner 4788
        Underhulls
        Bow & Stern Thrusters
        Hydronic heater
        330 Cummins

        Comment


          #5
          Originally posted by stanfromhell View Post
          ABYC H-33-6 states that metal deck filling components must be bonded. There is no mention of bonding being required for diesel fuel filter housings
          this is correct... the metal deck fitting must be bonded to insure that any static is discharged before fueling... diesel or gas doesnt matter, its a "blanket" coverage rule...

          the filters have no need of being bonded, as either they are insulated from, or directly connected to the engine, but either way no electricity or stray current is "passing thru" them....


          NU LIBERTE'
          Salem, OR

          1989 Bayliner 2556 Convertible
          5.7 OMC Cobra - 15.5x11 prop
          N2K equipped throughout..
          2014 Ram 3500 crew cab, 6.7 Cummins
          2007 M-3705 SLC weekend warrior, 5th wheel
          '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
          Heavy Equipment Repair and Specialty Welding

          Comment


            #6
            What is the harm in having them connect since the wiring is already there?
            Mark
            USCG OUPV
            1990 4588
            Carlsbad, CA

            Comment


              #7
              No harm at all in my opinion
              Stan
              2001 Bayliner 4788
              Underhulls
              Bow & Stern Thrusters
              Hydronic heater
              330 Cummins

              Comment


                #8
                Originally posted by Destiny_4588 View Post
                What is the harm in having them connect since the wiring is already there?
                there is no problem until there is a problem... the filters are isolated, but as they are now bonded, if at any time, there is any stray current develops, it may take current to the filters which otherwise would remain isolated.

                when one ponders the Risk vs Gain, you will see the risk is small, but either way you look at it, there is absolutely NO gain by having the isolated filters bonded.... just another wire to add to the spider web of wiring in the boat...
                kind of like bonding all your deck hardware, its unnecessary.


                NU LIBERTE'
                Salem, OR

                1989 Bayliner 2556 Convertible
                5.7 OMC Cobra - 15.5x11 prop
                N2K equipped throughout..
                2014 Ram 3500 crew cab, 6.7 Cummins
                2007 M-3705 SLC weekend warrior, 5th wheel
                '04 Polaris Sportsman 700 -- '05 Polaris Sportsman 500 HO
                Heavy Equipment Repair and Specialty Welding

                Comment


                  #9
                  Centerline has a a very good point. Keeping the boat simple has sooooo many advantages over adding stuff that is not necessary.
                  Stan
                  2001 Bayliner 4788
                  Underhulls
                  Bow & Stern Thrusters
                  Hydronic heater
                  330 Cummins

                  Comment


                    #10
                    Originally posted by Destiny_4588 View Post
                    What is the harm in having them connect since the wiring is already there?
                    I suspect you shouldn't want to create an alternative path for stray current if the intended bonding were to fail (or for any other unknown reason).

                    1988 3888
                    Twin Cummins 6BT's 210hp
                    Onan 8.0
                    Boating Raritan Bay

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