That is (should be ) a really high quality hose, try cutting a bit off the end and reclamping with a gear clamp. Make sure the nipple isn't damaged. If the seal around the sender was leaking it would set a code with a tank leakage test which the DME does every so often or you can force in INPA. This might be a good time to check the syphon jet if that hasn't been done.

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)