Max I have replaced the primer bulb and the rubber valve below it. All fuel lines are new and I have tried the 2 diaphrams which were in the new carby that I got. I have double checked the assembley order ie gasket plate diaphram gasket body gasket metering diaphram cover. I have not replaced the O ring where the main jet is as I don't have one as yet. Also I found that if I release the pressure on the bulb very slowly fuel moves through the system without the air bubbles coming out but when I relase it quickly the bubbles appear ? The plastic body assembley appears to have no cracks in it. I have a a repair kit K20-WYJ on order but it looks like it is the wrong kit, hopefully it has the O ring in it. I will order the correct kit WYJ-8-1 soon. Thanks for the info
