The last 5L will get you 15-20 miles it's not mere minutes.

Watching the test six once the tanks split left/right (about 30L total) the right tank will stay the same until you run out of gas. You can tell of there is a soft failure without running out of gas very easily:

The right tank number will stay the same on level ground. In my wife's case 1.4L (there is an additional 3.6 L not displayed).

You can drive for quite a long way while that number slowly drops, for example once the number drops to 1L there is still some gas coming from the left tank just not more than is being consumed. I've driven 40+ miles watching the level in the right go from 1.4 to 0.9L.

So: drive down to 1/3 of a tank and watch the right tank value. If the number drops, you have either a leak in the siphon jet or a weak electric fuel pump.

The flawed design of the siphon jet guarantees a failure at about 3-4000 hours. I recommend fixing the o-ring preventatively at 3000 hours. (100000 miles if you average 33mph.)


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)