1. Can the fuel tank be cleaned without removing it? If yes, what is the best way to clean a fuel tank still on the tractor?
I don't really know of any safe or efficient way to do it on the tractor.
2. Is it hard to remove the fuel tank on the D4006? (It looks kinda hard but maybe there's a good way to remove it)
No clue.
3. How do you clean a fuel tank that is off the tractor?
Depends on what is in it.
If it's diesel slime, dump it, put some E85 gas in if you can find it, or gas with 10% ethanol will work. Slosh it around, if you can access the inside through the filler or gauge hole, swab it around with a rag and a stick, dump, repeat until it is clean. You can blow the gas out with compressed air or a leaf blower. But under no condition try to vacuum it out with a shop vac!!!
If it's rust, you can try dumping some bolts and nuts in, tumble it, shake it, try to free up all the loose stuff. But, good chance it will leak afterward. There are some liquid liners, some are supposed to be really good, some aren't. I've never tried. You may get some recommendations from some who have successfully used it.
And you can also take it to a heavy duty radiator shop. They can chemically clean it. But again,if rusty, it may leak.
4. How do we know that we have thoroughly cleaned the fuel tank? In other words, what should we be looking for when examining the inside of the tank?
If it's just slime or dirt, the inside will appear clean. Try to get some rags inside to mop it out, look with a flashlight, you don't want any loose flakes or trash left behind. There may be a strainer on the outlet, be sure to remove it, clean or replace it, clean and test the valve.
5. Should we buy a new fuel tank instead of trying to clean this one? (Deutz Boyz may have one)
That is always an option, especially if it is rusty. I suspect anything you buy will be aftermarket, they are know for not being exact replicas, could be some fit and quality issues.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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