Do we have a vented or non-vented fuel cap?

[MrOneEyedBoh]

Do we have a vented fuel cap or not? I know we have the two vents on tip the fuel tank. But the tech manual says the cap is designed to relieve system vacuum...

 

[mint-6oh]

Your in evaporative emissions section of wsm. Only applies to gas vehicles

 

[MrOneEyedBoh]

Ahh, Okay then good to know. I didnt realize that... No option for Diesel.

Let me ask you this then. Why do they offer both vented and non-vented caps for our trucks from Stant?