a couple of times last trip the van refused to restart after a short stop. she span over ok........in fact too fast for my liking. seemed like there was no diesel going in. worked fine a short time later.......@2hrs the second time. there is a sigma alarm fitted, just wondered if this was a more likely candidate as ran like a dream the rest of the time. and would it show up on the mercedes diagnostic check...........if the worst comes to the worst.