I have hydronic heating in my home. Whenever the gas boiler is operating there is a 120 volt pump that circulates the water throughout the house. The pump motor is air cooled although it is enclosed in a steel case without fan or air circulation. It gets very warm to the touch through most of the 8 month heating season. The boiler expert tells me this pump is original to the 1957 gas boiler. It has been running for 57 years without cooling or failure.
My hot tub which has been in constant operation for 8 years has three water pumps, two large ones that run intermittently (whenever the jets/skimmer run) and one small one that runs 24 hours/day. The small one was replaced two years ago and the two large ones have never failed. None of them are water cooled.
I have two 2002 fuel injected Ducati motorcycles. The fuel pumps are mounted in the tanks and are often not covered with fuel (I like to use the full range of the 5.5 gallon tanks). These are not direct injected engines so the fuel is constantly being circulated between the tank and the fuel injectors before being returned to the tank. After being run on a sunny day (the tank is in full sun, unlike CX-5), the tank is often too hot to hold your hand on it without getting burned. Even though this is a very high temperature application and one of the bikes has 60,000 miles on it, I've never experienced a fuel pump failure.