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When you say it won't hold pressure in the bulb what is it doing exactly? Are you able to pump and pump without it firming up?
If it pumps up firm initially that is all that matters. What you have to do is figure out if this is a mechanical issue, spark issue, or fuel issue. The way to do that would be to check engine compression, and then check spark output with a timing light. Has that been done yet?
Are you able to check engine compression and spark output, do you have the tools to do those tests?
Without the tools there is no testing that we can do together. Is there some way I can be of help to you? Did you have any generic or specific questions that you wanted me to answer? Or explain how we troubleshoot these in the shop, step by step, covering all bases?
Was there anything else?