This is the fuel pump. Ive never had one go wrong on any of my tenere's, before pulling it a part i would start with a few basic's, check the filters on the tank pet coks as these can clog if you have crap in the tank, then i would give the carb a good clean making sure the float works ok. Have you checked to make sure that the pipe that runs from the top of the fuel pump to the top of the left side inlet rubber the one with a small brass pipe sticking up, make sure the pipe is fitted properly. This is the vacume pipe and works the pump. Hope this helps skip
Do the best you can with what you have,
A stranger in a strange land now heading North South East West to.....