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Fuel Mixture

Jay Galloway I have a diesel Massey Ferguson 135. It has been running ok, but seems to be running very rich(too much fuel)in my opinion. Is there a mixture adjustment on tractor or injector pump to adjust? What indications should I watch for when adjusting?
thepumpguysc NO external adj..
I would change the air filters first, then have the injectors done..

GEEBEE Also check that the rubber hose from air cleaner to manifold isn't perished and colapsing, check to see if the Thermostart is bad and leaking diesel into inlet manifold.

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