A note for everyone...

After you fix this O-ring issue, to test the siphon pump system, once the fuel level is approaching 1/4, carry a gas can (the stuff you use to fill the lawnmower) in the trunk with 2-3 gallons, then keep driving so it drops to 1/8. This is how you safely test the system w/o being stranded.

On long road trips with gas stations far apart, keep fuel > 1/4 at all time if you can. It is really not fun being stranded in the middle of nowhere. In the city, you can easily get help. In the middle of the corn field, only the cows have sympathy for you.

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT