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Weed trimmer primer bulb does not pump full, and trimmer will run out of gas I have a Mcculloch edge trimmer. I replaced the two fuel lines but the fuel Primer/Bulb does not fill. There seems to be be an air bubble that does not want to feed through. Where the fuel lines goes into the holes in the tank, does the intake and overflow fuel lines both be submerged under the fuel level, or is there a possibility that there are an air leak somewhere?

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No, the overflow line does not need to be submerged. first make sure that the hose connections are tight and the "O" ring or gasket inside the gas cap is not damaged or missing. when replacing both lines at once, its easy to get them mixed up, so make sure they're not. remove the carbuerator and inspect the gasket; it should be soft and flexible, if its hard or brittle it needs replaced. it doesn't take much to clog it, so spray carb cleaner, available at local auto parts store, inside the fuel rails and blow out with compressed air. there might also be a pin hole or bad seal in the primer bulb and need to be replaced.

Posted on Nov 28, 2008

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Take the bottom off the carb (single silver screw). Inside you should see a small screen filter. This is rigid but can be pried out.
Remove and replace it, or clean it with carb cleaner. This filter clogs very easily, but must be totally clean in order for fuel to flow through. (This solved my fuel flow problem after having tried everything else ! )

Posted on Aug 09, 2009

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