Sounds to me you might have isolated the issue already.... unless I'm just all messed up. Which is usually the case.
The ECU pin out is NEGATIVE -- so it doesn't actually put out any "voltage" -- it just goes to ground - thus grounding the relay actuating it. The relay would have a big gauge wire ground - big gauge load positive - ignition 12V positive - and a ground. In this case the ground would go to the ECU...
correct me if I'm wrong -- so then the RELAY operates some kind of pump controller??? Or does the pump "controller" run the relay??
It's so hard to troubleshoot without a schematic to follow so I'm just picturing in my head - your particular set up and I'm unfamiliar with the Vaporworks (other than I know Carl and he and his stuff are GREAT!).
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