Re: 1990 Evinrude 15hp will not stay running
Go back to the opening page of this forum & down under "Repair & Maintenance" before you clicked onto the Johnson / Evinrude section, down near the bottom of this FAQ page you will find (9.9/15hp OMC Engines by "The Machinist"). In this are many articles that I have written which cover only 9.9 & 15hp OMC motors. I have a troubleshooting section there for these also. That may be a start.
A fuel pump is a possibility, however these hardly ever fail, while leaks in the fuel system are more common.