Joining the chat as I too have recently had this problem occur.
2008 GXL model, 245,500 km. One tank with one filler pipe. Sticker on inside of fuel flap: Diesel Capacity 138L incl. Sub Tank.
In July filled up and drove 704km before refuelling with 100 litres of diesel. Vehicle sat for 5 days as it often does and then we made the return trip. Made it approximately 500km before flashing fuel light illuminated. Normally it's a constant light and as I still had about a quarter tank left (as per gauge) I kept driving.
I made it another 150km before I "ran out of fuel". Now for 650km, I should have only used about 95 litres. Another car travelling with us made a quick run to the service station and filled a 20 L jerry can and we were mobile again. I filled up at the service station adding another 93 litres.
Talking to people I have been told there is a main tank and an auxiliary (sub) tank and both have a fuel pump. My unconfirmed theory is the sub tank fuel pump is either not pumping the fuel continuously or not efficiently. Either way I believe I have to remove the tank and test/replace the fuel pump.
