1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 20Get this manual
Fuel Tank Maintenance
The inside of the fuel tank should be cle aned once ach se asonDirt or water may have entered the fuel tank during refillingCle an the tank by flushing with cle an, le ad-fre gasoline or keroseneFUEL TANK FILTER If fuel restriction problem is encountered, the fuel filter on end of outlet tube may be obstructedR emove cover and inspect filter for varnish, dirt or depositsCle an filter by rinsing in cle an, le ad-fre gasoline or keroseneTo remove fuel line clamps, grip clamp with pliers and bend over, lapping hook backward
To install fuel line clamps, grip hose clamp with pliers and push down on hook with screwdriver until hooks interlock