Yesterday Numbnutz ran out of fuel - the gage has been acting up in the cold. So after filling the spin off filter and some hard cranking my 603 came back to life.
BUT now it won't shut off with the key.!
What have I done and what do I need to do?
Thanks for your help.

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Lee C.
87 300 TD 225000 k
96 300 D 82000 k