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lake weir skier
03-23-2014, 05:22 AM
While replacing my fuel tank sender, I encountered a ground wire attached to my fuel fill. The following thread containing a 2005 service bulletin talks about leaving such a ground wire disconnected, but appears to imply the recommendation does not apply to pre-1999 boats. Am I reading that correctly? Yet, I saw a longtime member post that he had disconnected the ground wire to the filler on a pre-1999 boat for safety reasons.

Possible Fire Hazard (http://www.mastercraft.com/teamtalk/showthread.php?t=10679)

I havenít completely disassembled this part of my 1994 boat, but it appears I have a metallic gas cap and chain and a metallic filler neck, for lack of a better term, that is inserted into a rubber hose that attaches to the top of my plastic fuel tank. Looking through the opening for fueling, I see metallic sides several inches down and then plastic deeper that is apparently inside the rubber hose. It looks like the section that would come in contact with a gas pump nozzle at a gas station is metal. I donít think such a nozzle would reach the plastic.

Is this 2005 service bulletin up to date? Why does the recommendation in it differ for plastic fuel fill assemblies with metallic caps and retaining chains as compared to all-metallic fuel fills? If your boat has such a ground wire attached to the fill, what have you done with it and why, especially if you have a pre-1999 boat?

mtajpa
03-23-2014, 11:34 AM
Mine was only disconnected from PO. Now its completely removed.

Traxx822
03-23-2014, 11:43 AM
My guess is its a bonding wire. The bonding wire is to stop electrolysis which can happen from plumbing using dissimilar metals; and stopping this current from running through all of your metal components. The belief is that this bonding wire will bypass the conductive parts and extend the life of the pump etc.

You will see this most commonly on water heaters in houses. Where a bonding clamp and wire is run from the hot to cold copper supply lines. This again is thought to extend the life of the water heater itself by bypassing the electrostatic currents that flow through the pipes.

There is no arguing that these bonding wires work. In my best professional opinion I would leave it. It is no safety hazard to you.

lake weir skier
03-23-2014, 08:32 PM
This regulation discusses the potential for a spark between a fuel nozzle and metal fuel fill or other metal fuel system component when fuel flowing from a dispensing nozzle generates a static electric charge. This appears to explain why the ground wire was attached to the fuel fill in the first place and why the above referenced service bulletin did not contain a blanket recommendation to remove the ground wire from the fuel fill, instead making a different recommendation based on the materials comprising the fuel fill.

FEDERAL LAW - 183.572 - Grounding (http://www.uscgboating.org/regulations/boatbuilder_s_handbook/fuel_standards_partp.aspx)

Cloaked
03-23-2014, 08:43 PM
This regulation discusses the potential for a spark between a fuel nozzle and metal fuel fill or other metal fuel system component when fuel flowing from a dispensing nozzle generates a static electric charge. This appears to explain why the ground wire was attached to the fuel fill in the first place and why the above referenced service bulletin did not contain a blanket recommendation to remove the ground wire from the fuel fill, instead making a different recommendation based on the materials comprising the fuel fill.

FEDERAL LAW - 183.572 - Grounding (http://www.uscgboating.org/regulations/boatbuilder_s_handbook/fuel_standards_partp.aspx)Correct

Unless you have a water heater in your boat.. :D

.

mayo93prostar
03-23-2014, 08:43 PM
My 93 prostar has this wire and it connects to the fuel gauge sending unit. I believe it is there to avoid static buildup between the metal filler neck and the fuel in the tank. My 93 does not have a fuel pump in the tank since it has a carb.

lake weir skier
03-23-2014, 09:22 PM
Correct

Unless you have a water heater in your boat.. :D

.

My boat doesn't have a water heater, and I probably don't need one being in central Florida, but I'm curious what is the significance of a water heater relative to the issue of a grounding wire attached to the fuel fill.

mikeg205
03-23-2014, 09:26 PM
my '95 has this wire and it is connected to the metal fuel fill assembly - which inserts into a rubber fuel filler hose... so based on this I should disconnect.

lake weir skier
03-23-2014, 09:28 PM
My 93 prostar has this wire and it connects to the fuel gauge sending unit. I believe it is there to avoid static buildup between the metal filler neck and the fuel in the tank. My 93 does not have a fuel pump in the tank since it has a carb.

The green wire I found attached to the fuel fill by one of the three screws that attaches the fuel fuel to the boat disappears into an area I haven't investigated but it shows continuity on my multimeter with the grounding point on the engine block.

thatsmrmastercraft
03-23-2014, 09:42 PM
Correct

Unless you have a water heater in your boat.. :D

.

The water coming out the exhaust is warmer than the lake water..........so does that mean I have a water heater??? What wires should I cut:rolleyes:

lake weir skier
03-23-2014, 09:47 PM
my '95 has this wire and it is connected to the metal fuel fill assembly - which inserts into a rubber fuel filler hose... so based on this I should disconnect.

Well, that is what I'm trying to figure out for my 1994 boat. My reading of the technical service bulletin was the official recommendation was to NOT disconnect if you have a metallic fill, which mine appears to be. The technical service bulletin quoted at the link above makes reference to a plastic fill by Perko. I went on Perko's website and found a fill that clearly has a plastic neck, for lack of a better term, but mine looks metallic. The Perko installation instructions say not to use a ground wire on that plastic design, but my design looks different. I'm going to call Mastercraft and see what they have to say.

Table Rocker
03-23-2014, 09:55 PM
Our pre '99 boats have metal fills. The service bulletin states: However, please note that this directive applies only to PLAS-TIC fuel fill assemblies with metallic caps and retaining chains; the U.S. Coast Guard and ABYC standards still require that any ALL-METALLIC fuel fills continue to be bonded.

MasterCraft knows what fuel fills were used on our boats and made the change for '99 forward.

Our pre-'99 boats (having metal filler necks) should continue to have the filler neck bonded to the boats ground bonding system.

mikeg205
03-23-2014, 09:57 PM
thanks Rocker..

lake weir skier
03-24-2014, 11:59 PM
I called Mastercraft today about this issue. They said they have put out nothing additional on this issue since the 2005 technical service bulletin referenced above.

Traxx822
03-26-2014, 07:47 AM
Mike, no reason to remove a perfectly good bonding wire. You have a metal kneck just like mine? If so then leave it.

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