Not sure expansion and contraction would amount to much. If the steel line got smaller, then the steel tank got smaller, and the iron block got smaller, and whole tractor got smaller, so the distance between things would be about the same. Since the linear coefficient of expansion for steel is around 2*(10)-5th per degree C, so a 2/3 meter fuel line going from -20C to 80C would only change about .040"-.045". Still it's something to consider, but I hope you don't have too many times when the fuel line gets hot! I still bet it was for vibration and assembly variations. BTW, if you can find someone with a nice tubing bender for small to medium sized brake lines, you can make one that will look very sharp. Also, if you feel up to it, you can buy the new gland ends and nuts for the line from Robert's Carburetor. Add a little tinning, and you can solder new glands and nuts on there and have really nice looking fuel line. That's nearly always one of the most tacky looking items because they get beat up over the years and replaced with copper.
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