31/07/2014 11:06I am moored in Spain, and have had a problem with diesel bug. The engine stopped as the filter etc was blocked with black sludge. The marine engineer in our marina pumped all the diesel out of the tank and told me to fill the tank with fresh diesel right to the top, and keep it topped up at all times. The Engineer doesn't speak English and my Spanish is limited, so asking other questions was somewhat difficult. What I would like to know, is there a treatment that I can put in my tank to try and stop this occurring again. The engine in question is an inboard Volvo Penta MD and the fuel tank is under one of the bunks in an aft cabin (Extremely difficult to remove) Any advice would be appreciated.