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Fuel pump

Tiny
85TNGUY
  • MEMBER
  • 2011 CHEVROLET AVEO
  • 1.6L
  • 4 CYL
  • 2WD
  • 150,000 MILES
I bought a feel gauge I did a fuel pressure test and it shows that my PSI is around 40 to 45 it does hold its pressure. However, I looked around online many say that my fuel pump pressure should be at 50 psi. I'm going to the dealership for them to test my fuel pressure, I believe the gauge I have is either defect or something what would be some of the symptoms of a fuel pump not putting out the correct fuel pressure?
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Monday, May 18th, 2020 AT 9:59 AM

5 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

Yes, it seems that your fuel pressure is low.This could be a sign of a weak or failing fuel pump. I've attached a tutorial on how to test fuel pressure.If you don't have a fuel pressure tester most auto parts stores have a tool loaner program and can rent you one.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

The specifications for your car are 53-60 p.s.i. with key on engine off. Picture attached below.Hope this helps and thanks for using 2CarPros.
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Monday, May 18th, 2020 AT 2:05 PM
Tiny
85TNGUY
  • MEMBER
  • 19 POSTS
This is pic is with vehicle on. I did test it, with key in on position engine off, it was 43 to 44 psi.
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Monday, May 18th, 2020 AT 3:54 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Yes, the pressure is low on your car. I've attached the pressure specifications for your car in my prior post. Usually symptoms for low pressure is for the car to not start or stall out while driving. Having a hard to start condition as well. You didn't specify any symptoms in your question so I'm just curious to know if you might be experiencing any of these symptoms. Hope this helps and thanks again for using 2CarPros.

Danny-
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Tuesday, May 19th, 2020 AT 12:27 PM
Tiny
85TNGUY
  • MEMBER
  • 19 POSTS
Since putting engine mounts on, hesitation, bucking, cabinet noise, was eradicated 100%. I do have a misfire fire on 3 cylinders, but the values is low and no check engine light, did some digging the car PCM no what amount pressure volume ect the injectors need to run efficiently, based on my reading psi, I'm 99% sure it's the problem. It's a AcDelco pump, I have on it, saw some reviews on Amazon stating the pump does not give out the right pressure, so I'm going with gm genuine part. P.S. Psi do hold don't no if it's the pump, volume, clog filter, either way I'm replacing pump.
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Tuesday, May 19th, 2020 AT 12:50 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello again.

Okay, sounds good.Keep us updated after replacement and let me know if you have any further questions. Here is a tutorial for replacing an in-tank pump:

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

I've attached picture steps below for your Aveo. Hope this helps and thanks again for using 2CarPros.

Danny-
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Tuesday, May 19th, 2020 AT 1:37 PM

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