[newsomer]

This'll show just how little I know about diesel or the Duramax but I forge ahead nonetheless. The other day my new-to-me truck was on a lift and I got to have a good look around. I noticed something that had a radiator/cooler design just in front of the fuel tank. Are there conditions that require the fuel to be cooled on its way from the tank to the engine?

 

[DuraTitus]

Yes the fuel goes through the Fuel injector control module to keep it cool.

Actually I believe the excess fuel from the return lines goes through the fuel cooler on it's way back to the tank.

 

[newsomer]

Thanks, I didn't know that fuel was returned to the tank.