I'm kind of wondering why you are using the low-sulfur stuff - since farm and off-road fuel will still be around for a few years yet.
I don't believe the story about low-sulfur causing the problem. I also doubt pump shop people know the cause. They can suspect certain things, hear rumors, read conflicting service bulletins - just like anybody else. I worked in a pump shop back in the late 70s when Stanadyne pumps were failing often in GM diesels. I heard an awful lot of possible reasons given - by General Motors, Standyne Corp., etc. The truth is - a guy in the pump shop does not necessarily know more than anybody else as to what causes a problem in a pump unless it is overt.
This I do know. Now that ultra-low sulfur diesel is " hydro-cooked" to get the sulfur out - many additives are put in to bring the lube-quality up afterwards. It is possible that some of those additives are the "straw that breaks the camel's back" with older o-rings and seals. This also happens with bio-fuel - very often. Even eats up old fuel lines.
In regard to your CAV pumps? If they are rotaries, and they are leaking at the back of the pump - they do NOT have to come off the tractor. It's a 15 minute fix. On the back is an end-cap that's held on by four screws or small bolts. It is the regulator and wear-plate for a low-pressure, vane fuel pump in the pump. All that needs to be done - is you take the scews off, pull the cap off, put a new o-ring in, and put back together. Easy to do - no adjustments get changed. We had many brand new John Deere tractors - especially the 2940s - that we had to pull those plates off and fix before they even got sold. Now - if the leak is somewhere else? Different story.
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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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