AH HA!!!
I like discussions like this just because I learn something.
I've always found wiring to be just like a motor --- basics --- fuel/air/spark...
Wiring always seems to come down to voltage/connection/grounds....
So I'm going to assume that Carls/Vaporwork controller is PWM (pulse width modulator)?? Where it really doesn't drop the voltage -- but rather, modulates the 12V to reduce pump speed... which saves the pump in the long run...
Or does it reduce voltage to the pump (which in my ever so humble opinion isn't a good way to run electric motors...) Which is why I would assume it's PWM based.
Glad you got it! Because these kinds of little issues can be really "trying". Amazing how nothing more than a bad ground can keep your car from running!
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