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Author Topic:   Fuel System Bonding and Electrode
offshore27 posted 04-12-2006 08:12 PM ET (US)   Profile for offshore27   Send Email to offshore27  
I currently have the floor out of my boat and took the time to follow all the heavy gauge green wire the bonds the fuel tank. All looks ok except where it exits the boat at the end of the system on the bottom of the hull.
What type of bonding plate (ie what kind of material)did Whaler use as original eqipment.


jimh posted 04-12-2006 08:51 PM ET (US)     Profile for jimh  Send Email to jimh     
My observation regarding the grounding of the fuel tank in boats made by Boston Whaler which have a metallic fuel tank:

--the original configuration was to isolate the fuel system and its bonding from the battery. All metallic components of the fuel system were bonded together with a 10-AWG wire with green insulation. A sintered bronze electrode was installed below the waterline on the transom and bonded to the fuel system.

--sometime after c.1992 this was changed to eliminate the sintered bronze electrode on the transom. The metallic components of the fuel system were bonded to the battery negative. Note that the outboard motor is also bonded to the battery negative, so when the outboard is immersed in water the fuel system would be coupled to the sea via the sacrificial anodes of the motor.

I mention c.1992 as an epoch because I have a 1992 Boston Whaler boat and it still has the sintered bronze electrode.

jimh posted 04-12-2006 08:52 PM ET (US)     Profile for jimh  Send Email to jimh     
The electrode was a sintered bronze electrode which was circular and about the diameter of a silver dollar. It was usually mounted on the starboard side of the transom below the waterline.
offshore27 posted 04-12-2006 09:00 PM ET (US)     Profile for offshore27  Send Email to offshore27     
Hi Jim,

DO you know where I can find a replacement sintered bronze elctrode

Backlash posted 04-13-2006 08:25 AM ET (US)     Profile for Backlash  Send Email to Backlash     
Offshore 27,

This is the grounding/bonding plate that was used on my 1991 21' Walkaround:

Mine is mounted on the center of the transom below the waterline.


andygere posted 04-13-2006 11:42 AM ET (US)     Profile for andygere  Send Email to andygere     
I've seen the plates at at least 2 Whaler dealers. I'd give Twin Cities Marine a call, I'd bet they have them in stock.

When I purchased my '89 Outrage 22 Cuddy, the tank ground was terminated in the rear sump, and the ground plate on the transom was long gone. I converted it to the newer system by simply grounding the system to the (-) terminal of my starting battery. The bronze disk would not provide a ground when fueling on the trailer, so I think the newer system is better. The old hole and clamshell provide a neat way to route a transducer cable down the transom.

Contender25 posted 04-13-2006 12:01 PM ET (US)     Profile for Contender25  Send Email to Contender25     
My 1994 Offshore 27 has the Guest Dynaplate the same one in the link provided by Backlash.

It is thru-bolted in 2 places located in the center of the transom.

I took mine off last year as it appeared to be in horrid shape but it cleans up very easily with a wire wheel and looked new when I put it back on. I did replace the brass bolts, washers, and nuts.

That should of read, I took mine off last year to replace not to remove.

Also the ground wires on the Offshore go all the way up the hard top to the aft aluminum legs, around to the bow rail, windshield and then down to the fule tank. There must be 100 plus feet of the wire, quite impressive.

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