Shouldn't it start after cranking and let off the key?
My real question is, when do you know when to let off the key if it doesn't sound like it's starting?
I keep cranking (for a bit) and pump the gas a couple times and when I hear the faster turn over, I let off the key.
By habit, I let off the key when I think it's starting, again by habit. Is that not happening with you.
But as mentioned, maybe a bad switch?