1990 Johnson Evinrude "ES" 40 thru 55 Service Repair Manual, P/N 507872, Page 225Get this manual
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Pump pressure up to 3-6 psi (21-42 kPa)If pressure gauge indicates leakage, submerge the gearcase in water to determine source of leakage as evidenced by bubblesIf the gearcase pressure gauge does not