Can’t figure out this sound.

[Dm23]

I’m trying to figure out what this sound is on my truck. It’s not the type writer ticking or the injectors. It sounds like something is drawing something in. I can’t pin point it. It does not seem like the fass pump to me but I could be wrong. Any ideas?

Source: https://youtube.com/shorts/ObW5o8JQ-Yo?feature=share

 

[Dm23]

Source: https://youtube.com/shorts/rL_ANF6orqw?feature=share

 

[2004LB7]

Sounds like a lift pump sucking air

 

[Dm23]

Sounds like a lift pump sucking air

A cause for concern?

 

[2004LB7]

If it is then you have a leak somewhere on the suction side of the pump or fuel lines. Not healthy for the pump or injectors. You can always replace one or more lines with clear vinyl and see if you have bubbles

 

[Dm23]

Ok, its always something lol, thanks for your input. I appreciate it.