Yeah, I noticed the crazy cost when I looked up the diagram on the JD site. It applies to all 1025R. Old or new, the cost is about $700. It appears to be a drop-in replacement old to new. It seems you can't order the tank without the fuel gauge, which I'm sure is part of what makes the cost so silly.This is one of those head scratching discrepancies in the parts catalog. My serial number is 225XXX, and I have the first design, with the all plastic filler and no metal inset. Even if you dropped to using the last 5 of my serial and the catalog serial, I still should have the metal insert. One of those that makes me say hmmm.
@arnoha ... take care of the fuel tank. The first design that we have is no longer available, and if I recall is over $700 to get the new tank and other pieces to replace it.
I've pretty much convinced myself this is about getting a metal spout grounded to the chassis of the tractor to avoid sparks. Diesel doesn't ignite quite as easily as gasoline, but try hard to enough to hurt yourself and you'll succeed.
The only other thing I can think of is that there were warranty claims on the neck and they wanted to go with something replaceable. Maybe folks were hanging cans and nozzles directly on the plastic, cracking the $700 part?