If you have the instructions then you know there are actually two tanks. Here's the parts view. Fuel FILTER/PUMP/FUEL level sensor
I believe one side has a Delivery unit with in-tank pump and the other side has the fuel filter and pump I don't know for sure.

Note this faint diagram there are two holes in the tank where parts are installed. If you've removed and inspected one side of the tank then how
about "carefully" checking the other side. BMW 07 10 x3 Fuel Filter 16147186454 | eBay

Here's a better view. RealOEM.com - Online BMW Parts Catalog

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