Powerpro 17" McCollich weed eater

Question edited for clarity.
Question moved from Cars and Trucks category.

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If it's the one that comes 'out' of the primer bulb it is the return line that goes in the fuel tank.

change the fuel lines over on the carby
you are trying to feed fuel through the primer line when the engine is running and that is why it is cutting out

check the compression on your weedeater low compression will cause this

I work with weed eaters and mowers. Weed eater fuel ratio is normally a 40:1 ratio. That usually all weed eaters fuel ratio.

Do not choke,Hold trigger down and pull the starter several time to clear the carb. of gas . You may have to remove the spark plug and dry it.

Use a hooked piece of wire to snag the filter through the fuel tank, it should pull off the fuel line.

If you bought it used, you can bet that they didn't run it out of fuel before they stored it, so the gas evapoated out of the carb and all that was left was oil, so mix your fuel 8 to one eight parts gas and one part oil, you'll have to hit the primer botton several times.

HOW IS YOUR FUEL LINES. SOUNDS LIKE IT MAY HAVE A AIR LEAK

Need to get the carb rebuilt..