Another thing that can be done. The small fuel bottle above the thermo start seams to always need filling. I owned a YM 3000 and a John Deere 950, I noticed that the 950 was self filling. Both Yanmar diesels were almost the same size. The Yanmar engine thermo start in the 950 was plumbed to the discharge from the injectors keeping the thermo start bottle always filled. Difference was the Deere bottle doesn't have a fill cap like the Yanmar does, only a inlet from the injectors, and a outlet to return excess fuel back to the tank. The little plastic fuel bottle is exactly the same size and bolts into the same bracket. The Deere thermo start fuel bottle was around $10, + the price of some small hose, well worth the price to always have that little bottle full of fuel. Highly recommend that change for any of the members that still have to fill that little bottle on a cold day.
Chris