I just got done putting a 4.3L engine back in a 96 GMC Jimmy 4x4. I am having a problem toubleshooting it. The engine fires but won't run. The fuel pumps runs, but the engine seems that it is not getting fuel. The fuel fliter is new and there no cut-off relay to reset like the fords have. So I don't know where to begin since there are some many damn censors. Any help would be helpfull in getting this truck to run.