If it happenes overnight, its usually electrical..if it happens
over time, its mechanical (Usually)

*Out Of Fuel
*Wrong Fuel (gasoline in tank)
*Batteries; not enough cranking power 500 cranking amps or more each
*Batteries Bad
*Bad Connections at terminals
*Inoperative Glowplug system
*Restricted Fuel filter, line
*Restricted Fuel return Line
*Restricted In tank Filter Sock
*Bad Fuel Pump
*Air In Fuel
*No Voltage to Fuel Solinoid On Injection Pump
*Extremly Worn Injectors or Injection Pump (this doesn't happen overnight)
*Broken Timing Chain
*Low Compression
*Severly overheated parts with holes and or pits

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