when to change fuel coolant?

[diesel71]

i see the fuel cooler and turbocharger actuator circuit coolant capacity is 2 quarts. im thinking this needs to be change like the normal coolant service intervals but being it"s a smaller amount of coolant the additives might not last as long. i have not found an info on the service intervals for it? anyone have some info??//

[heinzboy]

I think your the only one here with a 6.4 Paul. I am sure Doug will know though.

[diesel71]

well i dont have it yet,still waiting wtf is taking so long????????????/
i have alot of info on the engine but nothing on the service intervals for that?
if i dont find or here somthing fi ill make my own service interval....lol

[PSDPlayer]

The fuel and turbocharger cooling system is designed to remove some of the heat added by the high-pressure common rail fuel-injection system. The high-pressure common rail fuel-injection system uses fuel for lubrication and cooling, as well as being the working medium to create the high pressure. This adds a significant amount of heat to the fuel. The fuel cooling system is designed to keep the high-pressure pump inlet and fuel tank return below 70°C (158°F). The coolant pump is turned on by the PCM when it receives a signal from the fuel temperature sensor indicating the fuel temperature in the fuel filter module has reached 24°C (75°F). The PCM turns off the coolant pump when it receives a signal from the fuel temperature sensor indicating the fuel temperature is below 20°C (68°F). The coolant pump will be on under most operating conditions.
The fuel and turbocharger cooling system is also designed to remove some of the heat being transferred to the turbocharger actuator during engine operation and after engine shut-down. The system assists in limiting the temperature exposure to the turbocharger actuator electronics. The electric coolant pump can run up to 10 minutes after the vehicle has been shut off. This is to remove some of the heat in the turbocharger actuator following engine shut-down.
It is important to make sure the fuel and turbocharger cooling system is bled correctly and the coolant level maintained for optimum performance.


If its running the gold coolant which it is then you should be changing it just like the rest of the system. Hell it only holds a little over a quart of fluid. You could change it once a month, but I would think since the system is so small that it would probably be good to do it like every 30,000 miles since it doesn't see the corosion potential like the coolant in the block does.