A fuel line supplying fuel to several large industrial diesel engines is made of type M copper tube. The tube is 40 ft long. The fuel is dispensed by gravity feed from a tank that is 12 ft above the engines. Diesel fuel (modeled as dodecane) at 80°F is being transported through the line. The required flow rate of the fuel is 300 gal/hr and the allowable pressure drop in the line is 1 psi. Specify the appropriate size (standard diameter) for this fuel line. The minor losses due to fittings can be considered negligible.