2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 48Get this manual
PERIODIC MAINTENANCE
BREATHER AND FUEL LINE
Inspect initially after 20 hours (1 month) and every 50 hours (3 months) Replace every yearsIf leakage, cracks, swelling or other damage is found, replace the breather hose andor fuel line.