Andy, I'm not the expert on the fuel system. But I do know that if the pin as you call it, it's actually the control plunger isn't floating up and down your fuel problem will be rich. I think this is why up people people in the northern states need to put fuel stablizer in the tank before several months of storage. I drive my car in Texas almost year round. If your system pressure regulator is now adjusted properly along with the Air sensor plate your problem should be over. John Hervey www.specialTauto.com