BERWICK — A delivery truck with a leaking fuel line left a trail of diesel fuel from the Berwick-Nescopeck Bridge all the way to Blair Street here Thursday. Josh Hirner, Allentown, was driving a Ferguson Bath, Kitchen and Lights truck with products headed to Builders Direct, at the corner of Front and Blair, around 1 p.m., said Sam Parise, Builders Direct manager. Suddenly, Hirner noticed his fuel pressure…