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I have a 1981 IH truck with 3208 cat,after it sets 4 days 40 degrees or less it seems to lose fuel prime, runs rough until I pump the primer a few times then runs smooth. I have replaced the hand primer with new check valves with no improvement. All the filters are new and cannot find a fuel line leak. Wher else should I be looking? Does the injection pump have an internal chec valve?Thanks |