1980 Evinrude Outboards Service and Repair Manual 70/75HP models P/N 5494, Page 73Get this manual
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3-12 2 Start motor and observe gaugeminimumspressures shown below
INSPEClON
AND REPAIR
TANK OR HOSE APPEARS LEAKING FUEL OR FUMES, PRESSURE TEST ANK AND HOSE ASSEMBL BE