Secondary vacuum pump test - ZR-1 Net Registry Forums

kieranod1 · 06-19-2023

Hi guys, my 91' was running rough so I got so I got Marc's plenum video a new set of seals and gaskets from Jerry and started in. My vacuum pump was running continuously so I figured it was a leak under the plenum and while I was there I'd clean her up and do some preventative maintenance. I started at the vacuum reservoir and worked my way to the pump. I put my finger over the port that goes to the reservoir and nothing, pump keeps running. When I put my finger over the bottom of the "L" shaped port that runs to the top of the pump, she stops. Any ideas? Thanks

kieranod1 · 07-03-2023

Hi guys, just got my pump from Jerry and I realized that the vacuum nipple on the old pump was broken off and I was using the ambient port for vacuum. No wonder it kept running, anyway putting the LT5 back together and we'll see how it turns out.

HAWAIIZR-1 · 07-04-2023

Here is some info about the check valve that was the problem on mine.

https://www.zr1.net/forum/showthread.php?p=221908

Sent from my iPhone using ZR-1 Net Registry

Z51JEFF · 07-28-2023

That planum pull CD Marc makes it a must for anybody doing this for the first time. The fact that you can energize/operate the system and know if it's working before the plenum goes back on is worth the price alone.

kieranod1 · 08-04-2023

Hi guys, thanks for the help. I have the new pump installed and it works fine but it still takes a long time to pull enough vacuum to shut off the pump. then the pump comes back on after approximately 2 minutes. I'm sure the connectors on the vacuum lines are old and maybe dried out. Is there any sealant out there that I can use? I can't find the sealant that Mark uses on his video anywhere, I just need to close this issue out before putting the plenum back on. Thanks for your help!

Z51JEFF · 08-04-2023

You need to find the leak before anything else.

06-19-2023	#1
kieranod1 Join Date: Mar 2016 Location: Pittsboro,NC Posts: 19	Secondary vacuum pump test Hi guys, my 91' was running rough so I got so I got Marc's plenum video a new set of seals and gaskets from Jerry and started in. My vacuum pump was running continuously so I figured it was a leak under the plenum and while I was there I'd clean her up and do some preventative maintenance. I started at the vacuum reservoir and worked my way to the pump. I put my finger over the port that goes to the reservoir and nothing, pump keeps running. When I put my finger over the bottom of the "L" shaped port that runs to the top of the pump, she stops. Any ideas? Thanks

07-03-2023	#2
kieranod1 Join Date: Mar 2016 Location: Pittsboro,NC Posts: 19	Re: Secondary vacuum pump test Hi guys, just got my pump from Jerry and I realized that the vacuum nipple on the old pump was broken off and I was using the ambient port for vacuum. No wonder it kept running, anyway putting the LT5 back together and we'll see how it turns out.

07-04-2023	#3
HAWAIIZR-1 Join Date: May 2010 Location: Japan Posts: 3,582	Re: Secondary vacuum pump test Here is some info about the check valve that was the problem on mine. https://www.zr1.net/forum/showthread.php?p=221908 Sent from my iPhone using ZR-1 Net Registry __________________ Craig "ZR-1 NO KA 'OI" "ZR-1 ICHIBAN" 1995 #228 Black/Black with Dunn Heads ZR-1 owner since September 2003 ZR-1 Net Registry Founding Member #0074 NCM Lifetime Member #2048

07-28-2023	#4
Z51JEFF Join Date: Dec 2007 Location: Fremont,Ca Posts: 3,073	Re: Secondary vacuum pump test That planum pull CD Marc makes it a must for anybody doing this for the first time. The fact that you can energize/operate the system and know if it's working before the plenum goes back on is worth the price alone.

08-04-2023	#5
kieranod1 Join Date: Mar 2016 Location: Pittsboro,NC Posts: 19	Re: Secondary vacuum pump test Hi guys, thanks for the help. I have the new pump installed and it works fine but it still takes a long time to pull enough vacuum to shut off the pump. then the pump comes back on after approximately 2 minutes. I'm sure the connectors on the vacuum lines are old and maybe dried out. Is there any sealant out there that I can use? I can't find the sealant that Mark uses on his video anywhere, I just need to close this issue out before putting the plenum back on. Thanks for your help!

08-04-2023	#6
Z51JEFF Join Date: Dec 2007 Location: Fremont,Ca Posts: 3,073	Re: Secondary vacuum pump test You need to find the leak before anything else. Last edited by Z51JEFF; 08-04-2023 at 12:37 PM.