Primer button is cracked
Is the weed wacker getting to much air
How old is the machine? Do you leave gas in it in long periods of time? Do you use e10 fuel? I would simply just replace the bulb. You can get them cheap on Amazon or in a big box store for a little more. Usually a few screws you need to take off ( you may need to take off other stuff as a well depending on your model. Realize these bulbs are just thin tube like material. Try to use ethanol free premix. Big box stores or select few stations ( if any) in your area will have some. Ethanol is small engines worst nightmare. Wrecks havok on everything. Start with replacing bulb, simple YouTube search and 5 minutes you'll be done. Use ethanol free fuel /premix. The primer bulb should not have thay much pressure. If you've done any maintance make sure you put the lines on correctly
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