A diesel fuel pump on a pier in Stonington, Maine, on July 27.Photographer: Graeme Sloan/BloombergThe margin for making diesel from crude oil in the US has soared to more than $100 a barrel, setting new all-time highs as a global fuel-making crunch continues to exacerbate fuel prices.The widely watched gauge, known as the diesel crack spread, hovered around $100 a barrel on Tuesday down slightly from record highs over $102 a barrel. The spread settled in triple digits for the first time on Monda...