Bonding fuel filler in an aluminum boat

[oldhaven]

When running a bonding wire from the fuel filler neck to the tank gauge ground should the filler neck be isolated from the boat by a gasket or insulator? It would seem this added wire suggested by CG for all boats would defeat the attempt to isolate the boats aluminum hull from the battery ground if the filler neck was in contact with the metal hull, causing potential galvanic action..

Also, it must not be a problem to fill a permanent tank while the boat is on a trailer even though the boat is not in contact with the ground. Everyone does it. Automobiles have the same situation and I don't recall seeing warnings about touching the filler nozzle to a metal part before fueling up.

 

[oldhaven]

On second thought, a gasket, which my filler neck has, still won't do it since I am using through bolts to hold it on. Oh well, I'll just trust that every other metal boat out there is OK this way so I should be too.

 

[GA_Boater]

The signs, at least around here, do have static electricity warnings. And don't hone: while filling up!

 

[Watermann]

Neg to sending unit comes from the battery that gets ground from the motor which is bolted to the boat. Filler is grounded to the hull which is grounded to the battery which is grounded to the hull because of the motor bolted to it... and yet they want you to run a ground wire from the filler to the tank, except on a poly tank because they don't conduct or have the connection so you put it on the sender again which is grounded to the battery which is grounded to the hull because it has the motor bolted to it...

It all seems ridiculous to me and I guess if you have a plastic filler then all bets are off! Oh no my filler is SS!