Under bed electrical noise..

[Big Ron]

Anybody know what these are?  Located under bed on drivers side. Makes intermittent sound like a fuel pump with no gas in it.  

[GETGONE]

Evaporator pump for the fuel system to catch "harmful" vapors in the charcoal canister. Round thing is the pump, rectangular thing is the charcoal canister.

[Big Ron]

Thanks for the reply, much appreciated. 
 

[CamGTP]

He's right on the one, the rectangular brick in the charcoal canister but the round one with the hoses is just a evap vent valve. There is no pump for the EVAP system. It uses engine vacuum when the purge solenoid opens up by the engine to suck in the vapors that are stored in the canister.

 

A bad vent valve could make extra noise if it constantly opened and closed but they usually stick open which cause a check engine light to come on for a evap leak.

 

But if you just hear it every now and then, it's just the computer opening and closing the vent to store vapor in the canister that will be burnt off later.

Edited September 9, 2022 by CamGTP

[GMCustomerService]

20 hours ago, Big Ron said:

Anybody know what these are?  Located under bed on drivers side. Makes intermittent sound like a fuel pump with no gas in it.  

 

This is certainly not what we like to hear, Big Ron.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your truck. To do so, please send an email to [email protected] with ATTN: Big Ron/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s privacy policy, please visit https://www.gm.com/privacy-statement.html.
 
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