Humming from fuel pump or Autoride??

[Blk07Denali]

I am one nit picky person on my vehicles.  I understand the truck is new, but I've already bought parts to bring it back to new status in my eyes and or scheduled times to get it fixed.  I just picked the truck up on Wednesday, but I just now have noticed a slight humming sound coming from the rear DS of my truck.  Prior to buying my truck I had my mechanic check everything over and he said it was all good to go and that is was a great vehicle, exhaust is pretty loud in my opinion so maybe that is why I haven't picked up on the humming till now.  I haven't tried to load the vehicle with any tow or load since I've owned it.  The humming starts right away once truck is turned on (not just in on position but actually turned on and motor running) and the humming stops right away once truck is completely turned off.  We checked fuel pressure and everything and everything looks good, there is nothing in the DIC showing up.  Any suggestions?  I know I have autoride as its part of the package for 1 and for 2 I have the bowels under the rear suspension (bladders).  However the truck has what appears to be aftermarket tire stems coming from the rear of the truck right above the license plate, they have white caps on the ends?  Do I have to do anything with these?

 

Truck is 2007 GMC Sieraa 1500 Denali with 91k in real absolute pristine condition besides the above.

[redvett]

Fuel pump humming is normal dont worry about it.

[carnau]

On 12/24/2017 at 2:59 PM, redvett said:

Fuel pump humming is normal dont worry about it.

Definitely could be a fuel pump. As far as don't worry about it... That's a matter of opinion. If it were my everyday drive I would install a new fuel pump. A whining fuel pump means a struggling fuel pump. With that being said I have a 2001 Sierra farm truck that has been whining and loosing pressure for the last 4 years and I am not going to change the pump until it goes coput... But It never leaves my farm and If it goes out It's not gonna leave me stranded. 

 

The two bladders you have on the back are aftermarket. That's why you have valve stems on the rear of the vehicle. Nothing wrong with that but you don't have a compressor on the rear of your vehicle to cause any noise. That's why those were installed is because it doesn't have an auto system.

 

I have been using Amazon's fuel pumps and haven't had any problems with one yet. Not that I couldn't have a problem with it... I have had GM pump's bad out of the box which were $600+ pumps. But got $90 and the ease of replacing these pumps... If my everyday driver was whining... it would definitely get a new pump. And with Amazon prime's 2 day shipping it's not like you are gonna be without a vehicle long.

Fuel Pump - http://amzn.to/2DNyNtB

 

I would drive the vehicle till it had less that 1/8 a tank of fuel and then do a quick swap... That's just my opinion though...