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On mine, when it quit working, I could just give it a good flick of the finger and it would click and I'd be good to go (turn the key to run, wait 2 seconds for the fuel pump to presurize the line, and then flick it if you don't hear it "click"). Took me a year to figure that out (it was intermittent). Got a used one at a junk yard for $10.
I got one over the weekend but it actually didn't help. Only problem is i got it from a JY so there is the slight chance I got one that has the same problem. doesn't seem likely though. I'm gonna stop guessing and do some real diagnostics to figure out what the hell is going on. Here is my original post on the problem.