AWR-fix: e53 Fuel pump / siphon pump details

[scourtaud23]

I've got a good one for you tonight (Europe time).

I've driven close to a 1000 miles this week end (500 each way). Getting back this evening, my fuel went low, very low with no pump for 50 miles and I ended up having the car die on me when I finally got in sight of a pump. threw it in neutral and coasted it to the pump.

I tried starting it up with no success so I assume it was empty, the fuel gauge showed very empty.

Filled it up, put in as much as I could, insisting when the pump stopped : 74.77L

Started it up, let it run a few minutes, tried to fill it some more: 3.24L (and a small puddle stayed above the flap in the filler neck.

So my fuel tank is missing around 15 to 20L.

The only idea I can come up with is that the pump isn't properly seated but I doubt its the case (already made that mistake) and I doubt this would justify 15 to 20L not showing on the fuel gauge or in the engine to run.

Any ideas?