It looks like lamp cord but its actually heat resistant wire i forget what the application was but it can sustain heat and i wanted a gauge of wire that was not too thick so this is all i found. Good idea to heat shrink the whole thing, i have some thicker tube as well ill have to get in cut it up and slide it on again, maybe i will give it a month to see how everything is.
Thanks for all the pointers, a very simple solution to further increase the life of the pump, next if it fails it will probably be because of the ball getting chewed up inside the pump or a spring failure etc. I am not sure why they don't put the diode outboard, they can easily put it inside the casing where the thermal sensor is.
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