If the Force Ten diesel heater is one that uses the modified Primus burners, I have the following experience:
Some years ago I built a heater using one of those burners. Found that it was not really happy burning diesel... at least the diesel available in the real world. I recall
that the F-10 folks raved about "gin-clear" diesel available in Canada
, but I found that the stuff that I could buy didn't seem to meet their requirements. At any rate, it would burn, but carboned up very rapidly. Eventually I just started using kero, and it worked ok then.
Now have a drip-feed type pot burner (Fab-All)and it has been pretty trouble free.