Installing GPS tracker with fuel cut-off

[ErikS]

Hi

I have a GPS tracking system in my 2009 E70 with the M57N2 diesel that can execute a fuel cut-off when instructed via SMS. A relay will then break the chosen circuit, which in the enclosed manual is proposed to be the +12V going to the fuel pump.

So far I've figured out that my car has two low pressure pumps in the tank, and one high pressure pump on/in the engine, as well as a "control unit for fuel pump" (part no. 16147276046). I'm hoping for advice regarding what is the best place to put the relay that the GPS tracker controls. I'm hoping that there is a relay that controls the two low pressure pumps, and if so, I would like to attach my relay to that one. But so far I have not been able to source enough literature to locate any related relays, and have absolutely no clue as to what the abovementioned control unit does...

Any opinions on this? Help would be greatly appreciated!

P.S. Other ideas than fuel cut-of are welcome! Instead of actuating the relay I guess I could set of all the airbags