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Hi Lauren the easiest way to Blead these systems is to suck the fuel through the return line at the filter. This pulls all the fuel and air through the high pressure pump and primes the injectors. This is the most efficient way to do the job. Because even a small amount of air in the high pressure pump will prevent it from starting.
Open the fuel supply line into a container while it's pumping (running) and trying to start. When the fuel begins to run clear (no bubbles), then close the fuel line and it will light if all is in order.
It runs off the fuel from the priming cycle, so no fuel from impulse air/diaphram. Check impulse air line is properly connected, not cracked (leakin), else diaphram may need replaced (carb rebuild kit).
Sounds like you have an air leak. Either in the primer bulb is split or punctured, hole or leaking fuel line or primer bulb base, and is sucking air instead of fuel.
it sounds like the filter on the fule line is cloged try to remove the filter and then try to prime the trimmer. it it does you need to replace the filter. just about any filter that will fit will do.
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