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Are you sure about the model number? I see several 30CC engine string trimmers by Ryobi. Two are the Ryobi RY30040B (SS30) and a RY30544 (SS30).
For both of these models, mix a high quality 2-cycle engine oil at 2.6 oz. per gallon of gasoline to pour into the gas tank. This ratio is used in several other Ryobi string trimmer models. Many Ryobi product manuals are available here: https://www.ryobitools.com/power-tools/support/manuals . Most Ryobi gas powered and 40V battery-powered tools will have a model number that starts with RY. The 18 V battery powered models often start with a P.
I hope this helps. If you add a comment with the actual model number, I may be able to provide more information.
Is the fuel the correct type. Most weed trimmers use mixed fuels and they must be the correct mixture ratio of gasoline and 2-cycle oil. Some are 16 to 1, some are 30 to 1, some are 40 to 1. Check your manual or on the unit for the correct mixture ratio. If that is correct, and you are getting fuel and spark, the only other thing that would affect it would be a mechanical problem such as low compression due to using fuel with not enough oil causing premature wear. Best Wishes
A lot of the more modern Ryobis run 32:1 and 40:1. Since this is an older machine, and real old ones from the late 70's and early 80's ran 16:1 and 20:1, I would advise trying the 32:1. Be sure to use only synthetic oil as it will greatly increase the performance and life expectancy of the machine. 32:1 is 4oz/US gall. by the way. Post back if you need to.
Vacuum created by piston operation after closing the choke pulls fuel into carburetor port into engine. In much the same way as the primer bulb provides fuel for the port. These type engines usually take a few more pulls before they will start. And if there are any leaks in carb. system will be very hard to start.