Well, I am converted to an Elsbett single tank veg oil. It is awesome. The smell of vegoil and dealing with it is heaven compared to diesel. It will be interesting to see if my motor oil is a little less stinky in the future. Quite a project. $3k in my pocket in fuel per year at 15k miles per year.
First off, the aforementioned ATF with stop leak did not do anything. When I converted the car the weekend before last, I had to go after every fuel leak. It made sense to do all the hoses. The big undertaking was fixing the $5000 diesel injection pump. $10 worth of parts for this (rubber o-rings and copper washers), but an extreme amount of pain on my car.
The instructions for replacing the common cause is on dieselgiant and is perfectly applicalbe to the 1993 300sd except for one omission. After getting the line nuts and locking plates off (remove torx bit), the mother bleeper was getting the top part of each line in the pump off. It looked like a something you would undo with your hand. Dieselgiant made no mention of this being a royal beache or requiring special tools. Used two locking plates that match fairly close and plyers. Nada. Hammered with long ratchet extension and hammer (2 man job.) Nada. Move from 6 to postion 5; it took a whole rotation of this to get to where one could just use the pliers. Had to remove the priming lever to get position 6. You do not know pain or suffering until having to take a hammer to a $5000 pump. Yikes. Its finished and no leaks. Replace all fuel hoses in the conversion except for metal lines under the chassis. These will go soon with some hard plastic line from the kit that has a larger inner diameter than the metal lines. Criticla when you hit 20F in the winter and your oil is one step away from gelling. I will be winterizing my single tank setup with some custom stuff.
My injector 1 and 6 nozzles had to be hammered out to do the rebuild. A lot of black gunk holding them in.
My take is that I got no performance increase from the rebuild. My car already had rebuilt injectors from mercedes so they were half the age I thought. The Elsbett injector nozzles do not like straight diesel. Half way through the conversion ran with straight diesel and the diesel sounds were quite loud (on oil no sound, nice!). Elsbett injectors have greater spray pressure to compensate for increased viscosity of veg oil. Truth be told, its hard to give an accurate judgement. Per gsxr suggestion I will probably yank them and pop test/rebuild as necessary. As it stands, my sense is that the pop testing will reveal that they are close to spec.
I'll update in a few months on my pop test results and what benefit I perceive from this.