1998 Johnson Evinrude EC 50 thru 70 HP 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 systemOutboards require boat fuel system that is capable of high fuel flow rate with low pressure drop across the entire systemIt is very important that all boat fuel system components have the correct capacity and are properly installedABYC's Standard H-24 and ICOMIA's Standard No.17 are accepted as industry standards and should be referred to for additional information
INote permanently installed fuel system with excessive restrictions could exceed the VRO unit's pumping capacity and cause poor engine performance or serious powerhead damageTo evaluate the restrictiveness of permanently installed fuel system, refer to Testing Fuel System, this section Recommendations