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Vacuum pump question.

15 Z71
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15 Z71 Senior Enthusiast

15 Z71

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I have a 2015 gmc sierra 1500. My question is I have never had a problem with my original vacuum pump but it's loud. Sounds like a model T when it's idling.It  Drives me nuts. I do have a letter from gmc saying if I have any issues with it they would replace it with new pump. It's good for 10 years or 150,000 miles. Would they change it for being so loud? And as any one had it changed? And is it quiet? My friend has a 2018 with 5.3 and is very quiet when idling.

rav3 Senior Enthusiast

rav3

Posted
Posted

I don't have an answer for you but a question. What kind of loud noise does it make? Loke a bearing going out or a squeal? I'm trying to imagine what sound you're hearing & how you know that's it's from the vacuum pump. How many miles on your truck? is yours the 5.3 too?

15 Z71 Senior Enthusiast

15 Z71

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1 hour ago, rav3 said:

I don't have an answer for you but a question. What kind of loud noise does it make? Loke a bearing going out or a squeal? I'm trying to imagine what sound you're hearing & how you know that's it's from the vacuum pump. How many miles on your truck? is yours the 5.3 too?

Yes 5.3. Just sounds like an airpump. Almost like an air compressor running real slow. Not a bearing sound. 

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

I know taking the belt off is a pain because there is no tensioner but that would at least let you know if it really is the vacuum pump.

 

The high pressure fuel pump on the rear of the engine also makes a ton of noise on these trucks.

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rav3 Senior Enthusiast

rav3

Posted
Posted

Of all my searching over the last couple of years concerning the issues with this vacuum pump, I've never run across anyone posting about noise. All were about it not working or sucking up oil into the brake booster. If it is the pump, as you GM/Chevy dealer to check it out & see if they'll cover the cost.

Do never mentioned how many miles on your truck, as these are usually mileage related.

Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted

I currently have 153,000 miles on my 2015 which still uses the original vacuum pump without any issues at all. Motor has always had a high pressure fuel pump ticking noise that until I knew what it was drove me round the bend. I only notice it now in drive throughs where I'm close to a building with the window down. Maybe I'm just going deaf. :) Point is at first I though it was the vacuum pump as well. 

 

GM still sends me the ABS recalibration recall notice and I keep telling them they are not messing with perfect brakes. :idiot:

This was their second FIX for the pump failures that IMHO are more about keeping the oil clean than a mechanical defect of the pump itself. 

mikeyk101 Senior Enthusiast

mikeyk101

Posted
Posted
1 hour ago, Grumpy Bear said:

I currently have 153,000 miles on my 2015 which still uses the original vacuum pump without any issues at all. Motor has always had a high pressure fuel pump ticking noise that until I knew what it was drove me round the bend. I only notice it now in drive throughs where I'm close to a building with the window down. Maybe I'm just going deaf. :) Point is at first I though it was the vacuum pump as well. 

 

GM still sends me the ABS recalibration recall notice and I keep telling them they are not messing with perfect brakes. :idiot:

This was their second FIX for the pump failures that IMHO are more about keeping the oil clean than a mechanical defect of the pump itself. 

It's funny you bring this up because I never really thought about it. Mine too was fine with no issues when they did the recall flash one time when I had it at the dealer for something. Sometime after that, I began having hard braking problems and they ended up determining that the vacuum pump had failed and replaced it. Knock on wood, it has been fine ever since.

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Grumpy Bear Senior Enthusiast

Grumpy Bear

Posted
Posted
20 minutes ago, mikeyk101 said:

It's funny you bring this up because I never really thought about it. Mine too was fine with no issues when they did the recall flash one time when I had it at the dealer for something. Sometime after that, I began having hard braking problems and they ended up determining that the vacuum pump had failed and replaced it. Knock on wood, it has been fine ever since.

 

If you take apart the old pump and a new pump you will find the screens in the oil feeds are different. Finer in the older pumps. Oil is what makes the seal. If the screen plugs you loose the seal and then the brakes. One of the changing more than less pays dividends. 😉 

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15 Z71 Senior Enthusiast

15 Z71

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2 hours ago, Grumpy Bear said:

I currently have 153,000 miles on my 2015 which still uses the original vacuum pump without any issues at all. Motor has always had a high pressure fuel pump ticking noise that until I knew what it was drove me round the bend. I only notice it now in drive throughs where I'm close to a building with the window down. Maybe I'm just going deaf. :) Point is at first I though it was the vacuum pump as well. 

 

GM still sends me the ABS recalibration recall notice and I keep telling them they are not messing with perfect brakes. :idiot:

This was their second FIX for the pump failures that IMHO are more about keeping the oil clean than a mechanical defect of the pump itself. 

Maybe it is just fuel pump. I have never had recall done either and breaks work fine. I'm at 90,000 miles now.

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