1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 40Get this manual
To install the "0" ring in the connector, proceed as follows: aPlace drop or two of oil on the "0" ringbPlace 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 When reassembling the fuel hose, check for cracks in the primer bulb or in the hoseThe primer bulb must be attached so that fuel flow is from the shorter to the longer hose lengthFuel flow through the primer bulb is indicated by an arrowSee Figure 3-41