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Hey guys I noticed this noise about two weeks ago on my 2016 Cummins. It seems to be coming from the area of the fuel tank/ def tank. Any ideas what it could be?

 

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I don't know what it is but it doesn't sound good
 

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I get a similar sound before startup. This sound is a far too crunchy to be good. I believe it is the lift pump also. I know it is NOT the def pump.
 

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That is your lift pump sucking air. I've seen that before when there was a chunk of ice in the tank restricting the pick up also
 

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Just like everyone else said, it's the lift pump. When did you have your filter changed? How much fuel do you have left in the tank? Same as @Cowboystarr, I had it when the fuel-water separator filter changed out, but the sound was only there at 1st or 2nd prime.
 

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It’s been about 8k miles since the last filter change and there was a little over a half tank of fuel at the time of this video.
 

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Mine has made this noise since it was new. =\ I always thought it was the DEF pump or something else.
 

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Hey guys I noticed this noise about two weeks ago on my 2016 Cummins. It seems to be coming from the area of the fuel tank/ def tank. Any ideas what it could be?

Put your hand on the fuel filter on the frame rail, that’s where the noise is.
 
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