Jump to content

Fuel pump priming when doors open?

LSX Z28
 Share

Recommended Posts

LSX Z28 Enthusiast

LSX Z28

Posted
Posted

My 2020 2500HD gas sounds like the fuel pump or something similar starts up when I open a door. Is that normal? I only notice it when it has been parked in the garage for a while and I go out after it has been sitting for a while. It also did it the other day when I shut the hood after it had been left open for a few hours. 

  • Like 1
ShotgunZ71 Senior Enthusiast

ShotgunZ71

Posted
Posted

Yes, if the truck has sat for a decent amount of time, the pump will prime back up at first unlock. Only after it's been sitting still for a while. Merry Christmas, as well!

LSX Z28 Enthusiast

LSX Z28

Posted
  • Author
Posted
1 hour ago, ShotgunZ71 said:

Yes, if the truck has sat for a decent amount of time, the pump will prime back up at first unlock. Only after it's been sitting still for a while. Merry Christmas, as well!

Thanks! I assumed that it was normal, but figured I would ask. Merry Christmas to you as well!

  • Like 1
Christopher Murphy Enthusiast

Christopher Murphy

Posted
Posted

Does anyone hear static at idle with radio off and air off? Sounds like noise coming from the speaker or behind instrument cluster. Even changes/increases with engine rpm until it stops when rpm is up around 2k. Sounds like speaker static up on the dash. Can hear it at stop light or in driveway. 

  • 2 weeks later...
  • 5 years later...
Srode1 Enthusiast

Srode1

Posted
Posted

My '18 does that, I wondered what the noise was when opening the door.  My '15 did not do that - both 6.2 engines. 

GMCustomerService Senior Enthusiast

GMCustomerService

Posted
Posted
6 hours ago, Srode1 said:

My '18 does that, I wondered what the noise was when opening the door.  My '15 did not do that - both 6.2 engines. 

We would like to learn more. Will you please share you VIN via email at [email protected]? By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

Srode1 Enthusiast

Srode1

Posted
Posted
On 4/20/2025 at 2:48 PM, GMCustomerService said:

We would like to learn more. Will you please share you VIN via email at [email protected]? By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

Curious, why the interest in learning more - is this not supposed to happen on an '18?   My comment wasn't a concern just and observation.  

Pryme Senior Enthusiast

Pryme

Posted
Posted
13 hours ago, Srode1 said:

Curious, why the interest in learning more - is this not supposed to happen on an '18?   My comment wasn't a concern just and observation.  

Mine does it too. With all four doors and the tailgate. It’s my least favorite thing about my truck so I guess that’s not bad.  It’s so annoying because it will sometimes do it a couple times if I’m loading my bed and also opening doors. If it only did it with drivers door once it wouldn’t be too bad but why all the doors? Is someone going to enter the rear door or tailgate to start the truck? 

  • Like 1
TrueBlue Enthusiast

TrueBlue

Posted
Posted
On 4/20/2025 at 11:48 AM, GMCustomerService said:

We would like to learn more. Will you please share you VIN via email at [email protected]? By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

 

At least this time you're letting folks know that their information will be shared. Wish you had let me know when I bought my truck that you would be sharing my driving info with my insurance company. Not sure I'd trust GM with any further information about me or my truck at this point though.

  • Like 2
  • 1 month later...
carkhz316 Enthusiast

carkhz316

Posted
Posted (edited)
On 4/20/2025 at 1:48 PM, GMCustomerService said:

We would like to learn more. Will you please share you VIN via email at [email protected]? By sending us a message, you consent to the information you provide being monitored and recorded by GM or those acting on GM’s behalf, subject to the GM Privacy Statement: https://www.gm.com/privacy-statement.

Sheesh. This is why I can't take this lip service seriously when they don't even know how their own vehicles work.

 

 

Driver Door Open Prime (DDOP) or Wake-Up Fuel Pump Prime (WUFPP

 

 

 

TL;DR: This is by normal and by design. Beginning with 2017 MY vehicles, the fuel pump will prime in anticipation of a engine start/ driving event.

Edited by carkhz316
Pryme Senior Enthusiast

Pryme

Posted
Posted
On 5/26/2025 at 8:24 AM, carkhz316 said:

Sheesh. This is why I can't take this lip service seriously when they don't even know how their own vehicles work.

 

 

Driver Door Open Prime (DDOP) or Wake-Up Fuel Pump Prime (WUFPP

 

 

 

TL;DR: This is by normal and by design. Beginning with 2017 MY vehicles, the fuel pump will prime in anticipation of an engine start/ driving event.

Then it should do it upon opening the drivers door only. Mine does it with all four doors and the tailgate. Supposedly normal. Is someone goi by to start the truck from the truck bed?  It is a bit annoying imo. 

carkhz316 Enthusiast

carkhz316

Posted
Posted

2017-2018 are drivers door; 2019+ are any of them. So going by your avatar, I'd assume you have a 2020+ HD. My '21 behaves the same where if any door/ tailgate is opened after some time of dormancy, the fuel pump will prime.

  • Like 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • UrbanRage
      What have you done to your K2 today?

      By UrbanRage · Posted

      I have the same running boards on my truck and I do agree they are bulky. I also find myself stepping over them when getting in and out of the truck. Besides providing protection to the rocker panels, they aren't very useful.  I will be replacing them soon with the Amp Powersteps. 
    • ChristopherDobson
      Vehicle Payments

      By ChristopherDobson · Posted

      Monthly payment is only part of the equation. With today's prices and interest rates, I'd look at the total monthly cost: payment, insurance, registration, fuel, maintenance, and expected repairs. A vehicle that fits comfortably into your budget is usually the better choice than stretching for a higher trim. I've also kept my vehicles longer over the past few years. New cars have gotten expensive enough that driving one for 10+ years, while staying on top of maintenance, often ends up being the most cost-effective approach.
    • Grumpy Bear
      OCI, not when but why?

      By Grumpy Bear · Posted

      10 Ford and Chevy engines proven to reach 300,000 miles   You may note a common 3K OCI on this list of gas motors. I skipped over the diesels. Dh'O. 
    • jake111
      Gasser Subforum Has Been Quiet - - So, Regenerative Braking and Using L10

      By jake111 · Posted

      Thanks newdude!  By the time manual selection is needed, I'm probably too much of a control-freak to depend on the transmission sensing braking to activate automatic downshifting.  I would be anticipating the situation and already be manually downshifting.   This truck replaced a 2004.5 LLY diesel with the Allison 5-speed.  Putting it in T/H made noticeable differences (when the torque converter locked, upshift points, downshift behavior).  On this 2024 gasser with the 10L1000 I haven't been able to detect much, if any, difference.  Ok, I can never tell now when the torque converter locks up.  But I also don't notice differences in shifting.  For downhills, I've probably already manually downshifted by then anyway.  Since it's also more awkward (than the 2004.5) to engage/disengage I don't even bother.  Or maybe it doesn't really matter with just a 3k lb. camper in the bed?   Thanks also for the list of reasons the charging system might select various voltages.  However, what I am seeing doesn't fall into any of those categories.  It very definitely, and very consistently, rises after coasting/braking.  Maybe not immediately, but not very long after coasting/braking.  Very consistently drops voltage when no longer coasting/braking.  It might also be interacting with the camper battery charging (I might disconnect the camper and see if it changes the charging behavior).  I also need to recheck turning on headlights for when I want to force it to charge the camper.   Another JR, in June I converted the camper to LiFePO4.  Since it's not a good idea to try to charge lithiums directly using truck, I installed a Victron Orion XS DC-DC charger (which BTW is AMAZING!!).  Being cheap, I only had to buy that one item (besides the battery, of course) to do the conversion.  The camper OEM 120v battery charger (only 19 years old and works perfectly) and the truck feed the input to the DC-DC charger (not at the same time).  But I didn't want the camper charger feeding back to the truck so I kept the old separator.  I considered replacing the separator with a 30amp diode but that means more work and might add another 1/2 volt drop.  One thing that surprised me was the voltage drop over the long 10awg wire run, so I can only charge smoothly at 8 amps (because the DC-DC charger is completely configurable).  Another reason I don't want an added voltage drop with the diode.  I might also be a little lazy but all this work is being done under the sink with a small cabinet opening.    
    • davester
      cam upgrade in CA

      By davester · Posted

      apparently CA smog is (or at least was)  checking that the vehicle is using the oem and/or a ca smog approved tune, so I expect you'll fail inspection doing it.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...