1991 Johnson/Evinrude EI Outboards 2.3 thru 8 Service Repair Manual P/N 507945, Page 63Get this manual
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In-line Fuel Filter Sl 1 to
Oisconnect linkage to shut-off valveRemove gum and varnish
deposits washing in Engine
In-line Fuel FilterShut-off Valve2.3, 3.3