1988 Johnson/Evinrude "CC" 40 thru 55 Models Service Manual, Page 98Get 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 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 pumping capacity with excessive restrictions could exceed the VRO unit's
and cause poor engine performance or serious powerhead damage To evaluate the restrictiveness of permanently installed fuel systemrefer to Testing Fuel System, this Section