A fuel tender for providing fuel to an internal combustion engine of a marine vessel may include a first pontoon, a second pontoon, and a truss structure connecting the first pontoon to the second pontoon with the first pontoon being separated from the second pontoon by a pontoon separation distance that is greater than a vessel width of the marine vessel so that the first pontoon and the second pontoon can straddle a vessel stern of the marine vessel with the truss structure disposed above a stern deck of the marine vessel. A fuel reservoir may be mounted on the truss structure and have a fuel supply line extending therefrom, with the fuel supply line being fluidly connectable to a fuel inlet port for the internal combustion engine when the first pontoon and the second pontoon straddle the vessel stern of the marine vessel.