2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 19Get this manual
Features and benefits Low-pressure fuel pump The F225 has adopted newly developed, low-pressure electrical fuel pump, in place of the lowpressure mechanical fuel pump used in the previous electronic fuel injection systemWith the adoption of the electric pump, the routing of the fuel system has been made more compactTo prevent the over-pumping of fuel, this pump operates for 10 seconds, and stops for 20 seconds when the engine is operating at low speedsThe pump operates constantly if the engine speed is 1,200 rmin or higher, or for several seconds (which vary by ambient temperature) after the engine is startedAt other times, it operates for 10 seconds, and stops for 20 seconds to prevent over-pumping