.Check for leaking fuel in the engine bay, turn off hvac recirculute to see if there is a difference or not.
.Gas tank fuel vent hose broken, or worse, the nippe on the tank is broken.
. Under rear seat cushion, as desribed above.

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E53 X5 4.8is-Dinan S2-Street Brawler
E70 X5M-The stoplight shocker
AMG E55K-539 RWHP, 629RWTQ-my toy
GX470-the unbreakable truck.
F30 328i-JB4 STG 2. Daily MPG Work Beater
02-WS6, 6sp my other toy
...other stuff parked around here somewhere