I think some wires must be crossed, I know that plug is frustratingly small. It tested ok on the bench, not too likely it got messed up in that maner in transit.
can you trace your taps to the labled connectors (batt, gnd, inj,vss)
It might need a reflash if it was being powered from the vss on accident),
note: you can lift the plastic tang on the plug gently with an exacto knife and slide the pin socket out if you want to try it with the vss disconnected or need to shuffle pins around.
Do you know if you got a gph reading before you started driving (GH)?