Disconnect the 2 fuel lines from top of fuel pump assembly: push in the small tab at the edge the connectors with a small, flat head screw driver, then pull off the fuel line (have a rag under it to catch a dribble of gas). Rotate the connectors if you do not see the small tab.
Then remove the black plastic cover: This is a two part cover with a small center section partially covering the fuel connectors. This smaller piece is silicone sealed onto the larger cover and is also taped at one end with vinyl/electrical tape. A small knife will be handy to cut the through the seal (carefully). It's is actually quite easy once you see how it is done.
Remove the black cover and you will see two electrical connectors on the top of the assembly- one is in use for power, the other is not (presumably it is used for the fuel level sender that this fuel assembly usually comes with but is deleted as the M3W has a VDO fuel sender next to the pump assembly).
Test the existing electrical lead to the pump for 12 volt power: connect voltage meter and turn on the ignition, you should get a reading for 4 or so seconds while the fuel pump relay activates.
If power is good, test the fuel pump connection itself for continuity. If you do not get continuity, this means the wiring from the fuel pump housing connector to the fuel pump is either disconnected, shorted, bad or the electric fuel pump itself is bad. The next step is to remove, inspect and replace the fuel pump assembly if there are no loose connections inside.