FEDERAL LAW
183.572 - Grounding
Each metallic component of the fuel fill system and fuel tank which is in contact with fuel must be statically grounded so that the resistance between the ground and each metallic component of the fuel fill system and fuel tank is less than 100 ohms.
I grounded mine to my ground bar in the Cuddy ...
http://www.uscgboating.org/regulatio...rds_partp.aspx