Warning lights on Fiat Ducato

Hi everyone....Just signed up for the" Club Together" and read a few useful tips already. My problem is with a warning light showing intermittently on my '05 Ducato. No base vehicle handbook supplied when I bought the vehicle and  I can't  actually guess what the symbol means!!! It looks like the side view of a fuel can about half full of liquid and is on the bottom left of the dashboard display. Can any kind soul with a handbook shed any light on what it might mean?