1978 Johnson 4HP outboards Service Manual, Page 30Get this manual
If "0ring is damaged air will enter fuel line and carburetor motor will run out of fuel To remove the" ring from the connector, proceed as follows: aGrip the connector gently in vise between two wood blocksbPush the plunger down with the straight instrumentFigure 3-21Removing Hose Clamp
cInsert the hooked instrument between the0" ring and its seat with the hook in flat or horizontal position See Figure 3-27 dTwist the hook around to grasp the" ring, then pulloutTo install the "0" ring in the connector, proceed as followsaPlace drop or two of oil on the" ring bPlace the "0" ring on face of the connectorcPush the plunger down with the straight instrumentdPinch the "0" ring together and gently push into position with fingers