1999 EE Johnson Outboards 25, 35 3-Cylinder Service Manual, Page 61Get this manual
Boat Fuel System Recommendations Purpose
This information is provided to assist you in evaluating boat's permanently installed fuel systemLarge outboards require boat fuel system that has high fuel flow rate and low pressure drop across the entire systemIt is very important that all boat fuel system components are of the correct capacity and that they are properly installedABYC's Standard H-24 and ICOMIA's Standard No17 are accepted as industry standards and should be referred to for additional information
INote permanently installed fuel system with excessive restrictions could exceed the fuel pump's pumping capacity and cause poor engine performance or serious powerhead damageTo evaluate the restrictiveness of permanently installed fuel system, refer to Fuel Pump Servicing, this sectionRecommendations