Maybe they just don't worry about warm climates, Joe. The block and head don't get nearly hot enough to damage the hose (unlike the exhaust pipe) but if you need your farm's fire pump to work in Katharine (northern N.T.) in the middle of summer, you might get pretty unhappy if it had a vapour lock problem. Or then again, you might not have enough time to get unhappy.
Part of the problem is that some equipment is only used occasionally, and is therefore likely to still have winter petrol in it during the summer. That's why I try to be mildly conservative in what I suggest to people.
