Vacuum Pump Hose Routing/Troubleshooting - ZR-1 Net Registry Forums

EDT · 02-29-2020

I recently found what I think to be an amazing deal on a 1992 ZR-1 that seems to have been sitting for quite some time. I’ve been able to figure out and fix most of the issues I’ve come across so far, but one thing that is stumping me at the moment is the vacuum pump underneath the passenger headlight.

It appears to be missing at least one hose and has a golf tee shoved into another, which could possibly be correct, but I don’t think it should run continuously. The pump continues to run even when I disconnect and cover the main vacuum line that runs under the plenum. I do not have a high idle.

Could anyone give a picture or diagram of their pump with the proper hose routing? If that doesn’t help, am I correct in assuming the next step would be to go towards the secondary check valve or is there another possibility? I had to pull the plenum already to replace injectors and I did my best to make sure I didn’t have any vacuum leaks underneath.

Thanks for the help, Everett

Ccmano · 02-29-2020

The pump itself and it’s hoses look like this. Hook up the hoses properly including the one that runs under the plenum. If there is no leak in the secondary system and the check valve is sound the pump should stop periodically.
H

EDT · 03-03-2020

Thanks Ccmano. I had added the line that loops around from the white nipple at the bottom, but ultimately my problem was that someone had hooked up the main vacuum line that runs under the plenum to that white nipple and not the black one next to it. After swapping over everything works as it should.

32valvZ · 03-04-2020

Quote:

Originally Posted by EDT

Thanks Ccmano. I had added the line that loops around from the white nipple at the bottom, but ultimately my problem was that someone had hooked up the main vacuum line that runs under the plenum to that white nipple and not the black one next to it. After swapping over everything works as it should.

What car number did you get?

EDT · 03-04-2020

Quote:

Originally Posted by 32valvZ

What car number did you get?

1992 #210

32valvZ · 03-04-2020

Quote:

Originally Posted by EDT

1992 #210

Post up a few pics of her!!!

02-29-2020	#1
EDT Join Date: Feb 2020 Location: Covington, LA Posts: 9	Vacuum Pump Hose Routing/Troubleshooting I recently found what I think to be an amazing deal on a 1992 ZR-1 that seems to have been sitting for quite some time. I’ve been able to figure out and fix most of the issues I’ve come across so far, but one thing that is stumping me at the moment is the vacuum pump underneath the passenger headlight. It appears to be missing at least one hose and has a golf tee shoved into another, which could possibly be correct, but I don’t think it should run continuously. The pump continues to run even when I disconnect and cover the main vacuum line that runs under the plenum. I do not have a high idle. Could anyone give a picture or diagram of their pump with the proper hose routing? If that doesn’t help, am I correct in assuming the next step would be to go towards the secondary check valve or is there another possibility? I had to pull the plenum already to replace injectors and I did my best to make sure I didn’t have any vacuum leaks underneath. Thanks for the help, Everett

03-03-2020	#3
EDT Join Date: Feb 2020 Location: Covington, LA Posts: 9	Re: Vacuum Pump Hose Routing/Troubleshooting Thanks Ccmano. I had added the line that loops around from the white nipple at the bottom, but ultimately my problem was that someone had hooked up the main vacuum line that runs under the plenum to that white nipple and not the black one next to it. After swapping over everything works as it should.

02-29-2020	#2
Ccmano Join Date: Jun 2006 Location: Sparks, NV Posts: 2,843	Re: Vacuum Pump Hose Routing/Troubleshooting The pump itself and it’s hoses look like this. Hook up the hoses properly including the one that runs under the plenum. If there is no leak in the secondary system and the check valve is sound the pump should stop periodically. H