Went to pick up the Monaco last Saturday and it still had a quarter of a tank of diesel in it. However, the 'fuel low' light was flashing and 5 miles down the road (before I found a garage) I lost power. It was all the symptoms of running out of fuel, although it never completely cut out. I chucked £70.00 worth of diesel (the fuel guage DID move (a bit)) in it (just to get me home) and 130 miles later the chugging started again, still a quarter of a tank left!! 10 miles further on and the fuel light flashed on and off a few times but never stayed on. When I got home, I sat and read the manual and it said that the last 34 gallons of fuel in the tank were unuseable because of the flat bottom design of the tank!! Can anybody shed any light on this (not fuel lights Geo!)? Engine - 350 Cummins, 6 speed allison etc.. Duncan, I think the question might be aimed at you!!