pump noise when doing an air leak testing

Daxin · 03-18-2008

Hi,

I don't think this is normal that the pump is making a noise when I perform an air leak test. Would it be the check valve?

Thank you

dvldoc · 03-18-2008

The pump cannot clear the check valve with air in it your just dead heading the pump, If your doing a leak test you need only worry about fluid as it is a fluid pump. You need to prime the pump first then you can install the check valve from there run the pump and you can check for any leaks.

Daxin · 03-18-2008

When you prime the pump, do you need to take the check valve out and prime it out? I've primed the line and re-inserted into the check valve.

dvldoc · 03-18-2008

You just prime the pump so there is fluid in the head and it comes out of the outlet hose. After that just connect the hose back to the check valve and your ready to go. If you try to prime further you'll need to have the nozzle in place for the needed back pressure.

I always do a test spray with the nozzle.

Daxin · 03-18-2008

If the check valve is malfunctioning due to 20 psi, do you think the air pressure could force the air back to the pump?

dvldoc · 03-18-2008

The check valve is 16psi, The pump has a reverse check valve which is well over 100psi.

Have you primed the pump with the hose in place and had fluid come out?

Then reconnected the hose to the nozzle holder and test sprayed yet.

Also be sure you look at the arrow on the top of the pump and make sure you have it going the right way and you don't have the inlet on the outlet side.

Daxin · 03-18-2008

Yes, I have test sprayed it, but not with the nozzle connected to it. And yes the check valve is connected correctly.

I've had this car stored over the winter and when I took it out last weekend, it boogged and hesitated pretty bad. I checked for boost leaks and found that the air was going to the pump because I can hear it turning when I compressed it.

Could there be anything else?

This weekend I am going to try and run the car with the check valve closed. What size do I need to closed the inlet part of the check valve?

thanx for all you help.

Daxin · 03-18-2008

I forgot to mention that I had reduced the nozzle size before I had it stored, from M5 to M3, but I hadn't had any problems.

dvldoc · 03-18-2008

The OD needs to be 1/4" a rod screw or piece of hose that is sealed at on end will work as a plug. I would just epoxy a small piece of hose and insert it in the check valve. Or go to the hardware store to find a partialy threaded stud that is 1/4" OD and insert it to block it off.

I now see what your saying you did a boost leak test with the pump still connected. The reverse check valve is for fluids I'm not sure what would happend if you pushed compressed air through it, It could possibly damage the check valve and seal.

Just make sure you test the pump with the nozzle in place and make sure you get a proper spray pattern. The check valve is only one way so if your pressure testing the system air could go through it without being stopped.

Daxin · 03-18-2008

Hi, So the check can be the cause of the boost leak? I really hope this is all that is wrong.

thanx so much for your help. I've ordered a replacement part.

03-18-2008	#1 (permalink)
Daxin Water Injection Year: 1994 Make: Eagle Model: Talon Join Date: Apr 2007 Posts: 15	pump noise when doing an air leak testing Hi, I don't think this is normal that the pump is making a noise when I perform an air leak test. Would it be the check valve? Thank you

03-18-2008	#2 (permalink)
dvldoc DevilsOwn Staff Join Date: Apr 2005 Posts: 1,968	Re: pump noise when doing an air leak testing The pump cannot clear the check valve with air in it your just dead heading the pump, If your doing a leak test you need only worry about fluid as it is a fluid pump. You need to prime the pump first then you can install the check valve from there run the pump and you can check for any leaks. __________________ Currently deployed to Ramadi 1 battalion 12th Marines see you in 8 months.

03-18-2008	#3 (permalink)
Daxin Water Injection Year: 1994 Make: Eagle Model: Talon Join Date: Apr 2007 Posts: 15	Re: pump noise when doing an air leak testing When you prime the pump, do you need to take the check valve out and prime it out? I've primed the line and re-inserted into the check valve.

03-18-2008	#4 (permalink)
dvldoc DevilsOwn Staff Join Date: Apr 2005 Posts: 1,968	Re: pump noise when doing an air leak testing You just prime the pump so there is fluid in the head and it comes out of the outlet hose. After that just connect the hose back to the check valve and your ready to go. If you try to prime further you'll need to have the nozzle in place for the needed back pressure. I always do a test spray with the nozzle. __________________ Currently deployed to Ramadi 1 battalion 12th Marines see you in 8 months.

03-18-2008	#5 (permalink)
Daxin Water Injection Year: 1994 Make: Eagle Model: Talon Join Date: Apr 2007 Posts: 15	Re: pump noise when doing an air leak testing If the check valve is malfunctioning due to 20 psi, do you think the air pressure could force the air back to the pump?

03-18-2008	#6 (permalink)
dvldoc DevilsOwn Staff Join Date: Apr 2005 Posts: 1,968	Re: pump noise when doing an air leak testing The check valve is 16psi, The pump has a reverse check valve which is well over 100psi. Have you primed the pump with the hose in place and had fluid come out? Then reconnected the hose to the nozzle holder and test sprayed yet. Also be sure you look at the arrow on the top of the pump and make sure you have it going the right way and you don't have the inlet on the outlet side. __________________ Currently deployed to Ramadi 1 battalion 12th Marines see you in 8 months.

03-18-2008	#7 (permalink)
Daxin Water Injection Year: 1994 Make: Eagle Model: Talon Join Date: Apr 2007 Posts: 15	Re: pump noise when doing an air leak testing Yes, I have test sprayed it, but not with the nozzle connected to it. And yes the check valve is connected correctly. I've had this car stored over the winter and when I took it out last weekend, it boogged and hesitated pretty bad. I checked for boost leaks and found that the air was going to the pump because I can hear it turning when I compressed it. Could there be anything else? This weekend I am going to try and run the car with the check valve closed. What size do I need to closed the inlet part of the check valve? thanx for all you help.

03-18-2008	#8 (permalink)
Daxin Water Injection Year: 1994 Make: Eagle Model: Talon Join Date: Apr 2007 Posts: 15	Re: pump noise when doing an air leak testing I forgot to mention that I had reduced the nozzle size before I had it stored, from M5 to M3, but I hadn't had any problems.

03-18-2008	#9 (permalink)
dvldoc DevilsOwn Staff Join Date: Apr 2005 Posts: 1,968	Re: pump noise when doing an air leak testing The OD needs to be 1/4" a rod screw or piece of hose that is sealed at on end will work as a plug. I would just epoxy a small piece of hose and insert it in the check valve. Or go to the hardware store to find a partialy threaded stud that is 1/4" OD and insert it to block it off. I now see what your saying you did a boost leak test with the pump still connected. The reverse check valve is for fluids I'm not sure what would happend if you pushed compressed air through it, It could possibly damage the check valve and seal. Just make sure you test the pump with the nozzle in place and make sure you get a proper spray pattern. The check valve is only one way so if your pressure testing the system air could go through it without being stopped. __________________ Currently deployed to Ramadi 1 battalion 12th Marines see you in 8 months.

03-18-2008	#10 (permalink)
Daxin Water Injection Year: 1994 Make: Eagle Model: Talon Join Date: Apr 2007 Posts: 15	Re: pump noise when doing an air leak testing Hi, So the check can be the cause of the boost leak? I really hope this is all that is wrong. thanx so much for your help. I've ordered a replacement part.