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2000 BMW 3 Series is not equipped with a fuel cut off switch. The fuel pump is powered by the fuel pump relay, which is controlled by the Powertrain Control Module (or, as BMW calls it - the Digital Motor Electronics Control Unit "DMECU").
Now im not sure since the manual says your model has the same alarm system as the 328i and on the 328i you can remove the module to disable by doing the following. you can unplug the control module. It is located under the glove box. Climb under the dash on the passenger side and remove a few screws on the trim panel under the glove box. Theres a black control module with a green connector. There should be a lock tab on the connector. press the lock tab and pull out the connector. The alarm should now be disabled. But if it has the special transponder key this may not work.
But if the only reason you want to disable it is because of the motion sensor setting of the alarm for no reason there is a solution for this. To disable the motion sensor, hit the lock button to arm, then hit lock button again within four seconds to disable motion sensor. Red light on rearview mirror should flash four times, then pause, then start flashing on regular intervals. this is most likely the reason if your having the issue where the alarm goes off every 20 minutes. If you want to completely remove it below is a wiring diagram taken from the manual for you alarm system. this is from the manual its the alarm wiring diagram.
Battery Constant 12v Positive Wire ( ): Red/White or RedBattery Constant 12v Positive Wire Location: Ignition Switch Harness Starter Positive Wire ( ): Black/Yellow or Black Starter Positive Wire Location: Ignition Switch Harness Ignition Positive Wire ( ): Green Ignition Positive Wire Location: Ignition Switch Harness Second Ignition Positive Wire ( ): Purple/White or Purple Second Ignition Positive Wire Location: Ignition Switch Harness Parking Light Positive Wire ( ): Gray/Purple and Gray/Yellow. Use Both Wires. This vehicle has a dual parking light system that will require 2 extra relays. Parking Light Positive Wire Location: At Headlight Switch Power Door Lock Positive Wire ( ): White/Red Power Door Lock Positive Wire Location: At Factory Alarm Plug. The alarm plug is a black 12 pin plug located just behind the glove box. Power Door Unlock Positive Wire ( ): Blue/Red Power Door Unlock Positive Wire Location: At Factory Alarm Plug. The alarm plug is a black 12 pin plug located just behind the glove box. Door Trigger Negative Wire (-): Brown/Gray Door Trigger Negative Wire Location: At Factory Alarm Plug. The alarm plug is a black 12 pin plug located just behind the glove box. Domelight Supervision Wire: Turns On With Unlock Domelight Supervision Wire Location: N/A Horn Negative Wire (-): Brown/Red or Brown/Yellow Horn Negative Wire Location: At Steering Column Harness Tachometer Wire Negative Wire (-): Black Tachometer Wire Negative Wire Location: At Instrument Cluster Brake Light Positive Wire ( ): Blue/Red or Green/Red Brake Light Positive Wire Location: At Switch Above Brake Pedal Factory Alarm Disarm Wire (-): Disarms With Factory Remote Only. Factory Alarm Disarm Wire Location: N/A Factory Anti-Theft System: Transponder Anti-Theft System, Requires Bypass And Extra Ignition Key. The 1997 model year vehicle may require a bypass module and an extra ignition key, if vehicle is equipped with a special key from BMW. Factory Anti-Theft System Location: Transponder At Ignition Switch Tumbler if you require further assistance please let me know and i will help assist you from there. Thanks, Midwest-Tek
The fuel pump is located under the back seat on the passenger side. You will find an access cover and will need to remove the screws. You should be able to listen for the pump while someone cranks the car. Also I believe there is a large green w/ blue trace wire and an equally large brown wire at the connector. Check for battery voltage across the two wires. The fuse for the pump should be in the fuse panel under the hood.