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2001 Freightliner FL60, 5.9 Cummins,, Allison automatic, Air Park brake, Vulcan 892 wrecker bed. Truck does NOT RUN. overhauled lower end of engine, couldnt get it running, local shop said when cranking it would lose power to ECM. so they ran a jumper wire. i dont know if that is the problem or something else, engine will crank. seems lift pump is not pumping fuel. truck has been sitting for aw...