33 C.F.R. § 183.566 Fuel pumps: Placement.
Title 33 - Navigation and Navigable Waters
Each fuel pump must be on the engine it serves or within 12 inches of the engine, unless it is a fuel pump used to transfer fuel between tanks.
Title 33: Navigation and Navigable Waters
PART 183—BOATS AND ASSOCIATED EQUIPMENT
Subpart J—Fuel Systems
Manufacturer Requirements
§ 183.566 Fuel pumps: Placement.

