2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 283Get this manual
Fuel control system Checking the low-pressure fuel pump and high-pressure fuel pump
1Disconnect the starter relay lead (brown lead) to prevent the engine from starting4Check for continuity between the highpressure fuel pump relay terminalsReplace if there is no continuity5Check that there is no continuity between the high-pressure fuel pump relay terminals after disconnecting terminal or 4Replace if there is continuity
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2Turn the engine start switch to ON3Listen for the operating sound of the lowpressure fuel pump and high-pressure fuel pump 3Replace if there is no sound