my car wont start in the mornings but is fine during the day cloud of smoke

If its not a high compressin common rail engine, ie the old style diesel with the injector pump and pires, I suggest changing the glow plugs.
 
what color is the cloud, black-you could be running rich or burning oil.
blue-fuel system problem
white- head gasket is gone.....
i think your fuel pump may be bad but not sure
 
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