What are the benefits of adding a Lift Pump to a stock LMM Duramax?

[RustRevival]

I know the Duramax doesn't come with a factory lift pump, but how necessary is it if I’m not running a hot tune? Does it actually help the CP3 pump last longer, or is it just another expensive part that can fail?

 

[ChromeCrusher]

The CP3 has to work hard to suck fuel all the way from the tank. A lift pump like an AirDog or FASS removes air and supplies constant pressure. WHAT this does is take the stress off the CP3 and ensures your injectors stay lubricated with air-free fuel. It's one of the best "longevity" mods you can do.