Answering from the yacht perspective... the problem here is diesel bug.

Yachts are often powered by low power 1-cylinder diesel engines, and the engine's main use (for many sailors) being to get in and out of harbour, the main power coming from the wind.

As such, a tankful of fuel may last an entire season, and it may not have been fresh in the pumps to start with, in a smaller harbour or marina. Which is long enough to not just absorb moisture, but for diesel bug to grow. This is bacterial growth, and the problem is even greater with the introduction of biodiesel.

Diesel bug turns the fuel to jelly, clogging pipes and injectors, and a failed engine at sea is a safety problem if there is either too little wind, or too much. Fuel polishing can either eliminate diesel bug or keep it out of the engine.

If JP-4 doesn't suffer from "diesel bug", or fuel turnover rate is high enough that fuel isn't lying in the tank for months, this may simply not be an issue for aircraft (though ice is another matter).

Answering from the yacht perspective... the problem here is diesel bug.

Yachts are often powered by low power 1-cylinder diesel engines, and the engine's main use (for many sailors) being to get in and out of harbour, the main power coming from the wind.

As such, a tankful of fuel may last an entire season, and it may not have been fresh in the pumps to start with, in a smaller harbour or marina. Which is long enough to not just absorb moisture, but for diesel bug to grow. This is bacterial growth, and the problem is even greater with the introduction of biodiesel.

Diesel bug turns the fuel to jelly, clogging pipes and injectors, and a failed engine at sea is a safety problem if there is either too little wind, or too much. Fuel polishing can either eliminate diesel bug or keep it out of the engine. (You can also use anti-bacterial additives)

If JP-4 doesn't suffer from "diesel bug", or fuel turnover rate is high enough that fuel isn't lying in the tank for months, this may simply not be an issue for aircraft (though ice is another matter).

I'm taking a wild guess here that jets fill up more than once or twice a year!

Answering from the yacht perspective...

Yachts are often powered by low power diesel engines, and the engine's main use (for many sailors) being to get in and out of harbour, the main power coming from the wind.

As such, a tankful of fuel may last an entire season, and it may not have been fresh in the pumps to start with, in a smaller harbour or marina. Which is long enough to not just absorb moisture, but for diesel bug to grow. This problem is even greater with the introduction of biodiesel.

Diesel bug turns the fuel to jelly, clogging pipes and injectors, and a failed engine at sea is a safety problem if there is either too little wind, or too much. Fuel polishing can either eliminate diesel bug or keep it out of the engine.

If JP-4 doesn't suffer from "diesel bug", or fuel turnover rate is high enough that fuel isn't lying in the tank for months, this may simply not be an issue for aircraft (though ice is another matter).

Answering from the yacht perspective... the problem here is diesel bug.

Yachts are often powered by low power 1-cylinder diesel engines, and the engine's main use (for many sailors) being to get in and out of harbour, the main power coming from the wind.

As such, a tankful of fuel may last an entire season, and it may not have been fresh in the pumps to start with, in a smaller harbour or marina. Which is long enough to not just absorb moisture, but for diesel bug to grow. This is bacterial growth, and the problem is even greater with the introduction of biodiesel.

Diesel bug turns the fuel to jelly, clogging pipes and injectors, and a failed engine at sea is a safety problem if there is either too little wind, or too much. Fuel polishing can either eliminate diesel bug or keep it out of the engine.

If JP-4 doesn't suffer from "diesel bug", or fuel turnover rate is high enough that fuel isn't lying in the tank for months, this may simply not be an issue for aircraft (though ice is another matter).