Originally Posted by Dman115
I just did an h and s mini maxx and mbrp 5" exhaust on my 6.7 and noticed what sounds like a pump running for a while after the truck is off. I've herd it is the pump for the def tank getting the fluid out of the lines but am not certain. But anyway is this ok that it is doing this?
You hit the nail right on the head, its the def pump. Mine does it too, im pretty sure its fine.
Someone suggested H&S should have a update on the programmers to shut the def pump off. Havent heard anything since.
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