2003 ST 4 Stroke 9.9/15HP Johnson outboards Service Repair Manual P/N 5005714, Page 38Get this manual
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PERIODIC MAINTENANCE BREATHER AND FUEL LINE
FUEL FILTER
Inspect evey 50 hours (3 months) Replace evey 400 hours yearsIf wate accumulationsediment, leakage, damage is foundeplace cac