| It appears the connector is a "tap" into the fuel pump circuit.
As said above, pull the loop connector and the pump stops.
The brown/white is a Marrelli wire ID and appears no where else on the normal wiring.
It could well be for something as a tilt switch?? Datatool seem to have used it on some of their bespoke, plug'n'play, alarm systems. | 
Hybrid Mode
