1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, Service Repair Manual P/N 507875, Page 81Get this manual

1990 Johnson Evinrude 120 thru 140, 185 thru 225, 300 HP, Service Repair Manual P/N 507875, Page 81

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6 If you suspect the anti-siphon valve, perform these tests Remove anti-siphon valve from fuel tank and install adaptors and clear hose as shown Fill clear hose with water until "X" dimension is 20 in