Possible fuel problem with this as customer has almost run dry and then filled up with cheap supermarket diesel and straight away experienced problems with black smoke, rough running and engine rattle but NOT all the time.
Have seen the receipt and he definitly put diesel in it.
So, I am looking at draining the tank but not sure of best way to do it. The fuel does not smell as though it's contaminated but I need to eliminate it as a problem first before I move on.
Any help or advice on this would be greatly appreciated.