That's what the anti backfire valve is (technically a solenoid, which is a switch) to remove it you usually need to grind down a 1/2" wrench to fit in between the bowl and flats on the solenoid. Sometimes cleaning will help them, but alot of times it wont.
but first i would check to see if there is power on that red wire when the key is on. Set a digital meter to 20 volts DC.