Advice PLEASE for victa vantage fuel leak?

I have a Victa Vantage lawn mower and it is leaking fuel. I have replaced the o-ring in the primer plate as this was perished. I thought the problem would be solved, but it is still leaking from this section. Would this be a problem with something else or with the carby?? Does anyone have a link or pictures themselves of the assembley of this part?? I have been unable to find any web pages on the assembly of this, troubleshooting, or much else for victa lawnmowers. I would like to be able to fix it myself as I am unable to afford to have it fixed. Thanks in advance if you are able to help me:)