Bowtie, it's very likely that there was some sediment in there somewhere. We had virtually neverending problems with this on our previous mower because it simply didn't have a filter. We got so frustrated with it in general that we replaced it with a better one. (Although now we are wishing we went with electric rechargeable instead of gas.) Anyway, if there isn't a filter in the tank, be sure to install one inline.
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