Pump Sound Inside - From the back - Fuel Pump?

[Awfiretto]

ZW7 is Premium Smooth Ride Suspension, just standard shocks and springs.

ZW7 and G65 means that the rear shocks are self-leveling Nivomats.

There is no compressor associated with ZW7.

Z55 with G69 is what the LTZs, some SLTs and Denalis have and maybe the low end Cadillacs.

Z95 with G69 is Magneride. G69 is the RPO for the air compressor.

Makes sense! I was questioning it myself if it came with the pump, I found it odd not to see any real signs of it being there. The reflex shocks threw me off, maybe they are stock? But this post helps understand a lot.

 

[swathdiver]

Makes sense! I was questioning it myself if it came with the pump, I found it odd not to see any real signs of it being there. The reflex shocks threw me off, maybe they are stock? But this post helps understand a lot.

They would not be stock, someone must have changed them at some point.

 

[jmanson62]

Fuel pump. Mine does it too. Seems more so in the cold months.

Sent from my SM-G965U using Tapatalk

 

[89Suburban]

Here is a pic of mine in the rear, right above and behind the 2nd row seats driver's side on my Tahoe LT.