Question about Ryobi 30 Cubic Centimeter Curved Shaft Gas Trimmer

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Ryobi Gas trimmer fuel line routing

Hello,
I can't figure out the routing for the fuel lines on a Ryobi 700r gas trimmer. I have a hard time figuring out how two "Guru Rank" responses have opposite routing info.
It seems logical that the inlet end of the carb would be a gravity feed
so saying that the filter line would first go into the primer inlet doesn't make sense.
The "mdmcdowel" way has the primer bulb stuck on suction when I prime it (filter line to primer bulb suction).
The "mrfixit-jerr" way has the action of sucking fuel through the filter line through the carb via the return line, this way has air and fuel in the return line meanwhile the filter line is full.
Questions:
1. Should the return line have air with fuel as you're priming?
2. Should the carb inlet be a direct gravity feed?
3. Does the primer work by sucking fuel through the carb as opposed to pumping fuel in?
4. Are there markings on the carb to inlet and return?

Thanks in Advance

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  • 284 Answers

The fuel fillter line goes directly to the carb.inlet first
the outlet on carb.
goes to suction side of primer and outlet side of primer back to tank
primer draws fuel through carb. to prime

Posted on May 09, 2010

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