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Fuel air lock in Grass Scorpion trimmer

Primer bubble does not fill with fuel. Air lock somewhere in the line. How do I fix it?

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  • SoreArmRay Nov 24, 2008

    I have the same problem, and suspect the fuel lines are mixed up.

    So far I got this from the web

    RYOBI Grass Scorpion

    Fuel lines
    ==========
    1 - outlet from feul tank -> primer inlet(short writen IN)
    2 - free end of primer(long) -> spigot (brass) on top of carby
    3 - spigot at the buttom of carby -> fuel tank

    fuel line from tank goes to primer inlet which is shorte one (on top of it writen "in") and come out from other end of primer then connec to spigot at butom of carby ( L shape one) ?

    Farshad, you are wrong!- The line from the tank goes into the longer inlet, and the line into the carbie goes into the shorter inlet.

    Plug
    ====
    RST310SS,RCT2800A to 1/1994
    Model Standard Plug Gap (mm)
    Grass Scorpion T20M-U 0.6

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  • 163 Answers

Check the fuek lines for hole and leaks, check the fuel filter and clean if necessary. remove the carbuerator and inspect the gasket; it should be soft and flexible, if it seems hard or brittle replace it. clean the carb with carb cleaner sray (available at any local auto parts store) and compressed air. make sure you get inside the small fuel rail holes. if that doesn't work have the carb repaired at a service center or replaced.

Posted on Nov 28, 2008

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