Make sure the cover is on the 12Volt supply cable, from ignition to the Glow Plug Feed. Place some grease on the nut.
The excess diesel return pipes should be checked periodically. The pipes connected to the injectors split with me recently, Sept. 2013. This splitting on all the return injector pipes caused the diesel to spray over the engine' They can easily be replaced by cutting to length and just pushing on to the injector. A hot engine helps the process.