My 1972 Ford 4000 smelling funny

[Alpagas]

Hello all

Starting sometimes this past winter, the exhaust of my tractor smelled "different" then usual. And if the exhaust fumes are toward me as i operate the tractor then i get dizzy real fast. Its like the cumbustion isnt complete or something. Ill remove the air filter this weekend to make sure its not clogged or anything. Any advise would be appreciated. I need to get my "Smurf" ready for hay season.

Thanks

 

[DiggerAtl]

Gas or diesel

 

[Alpagas]

OOps sorry... its diesel

 

[DiggerAtl]

Did you purge your fuel filters, or you may have some oil settle into the pistons and its burning off mine had a funny smell after it sat for the winter it's all gone now

 

[DLTTrekkers]

Thermostart not well ? Getting power all the time ....faulty ign switch ? Leaky injector ?