Low Vacuum Options - Page 3 - Chevelle Tech
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post #31 of 39 (permalink) Old May 15th, 19, 10:09 PM
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Re: Low Vacuum Options

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Originally Posted by blm View Post
Ok here is a question. I installed my CVR pump today and my Summit brand reservoir. I did start the car and let it run for about 10 or 15 minutes but didn't drive it. At idle every time I stepped on the brake the pump kicked on for about 5 seconds. Also I shut the engine off for about 5 minutes and when I turned the key back on the pump immediately came back on without stepping on the brake.
I assume this means a leak. What's best way to narrow it down? I installed 2 check valves, one on the reservoir, one between the T and the intake manifold. Plus there was already one at the booster. Have all check valves flowing towards the vacuum source and blocked the other way.
I did see one set up where they installed one right before the T but there is already one at the reservoir. I assume that one isn't needed. I also assume the reservoir isn't holding vacuum.

My pump also starts and runs after stepping on the brake pedal just once. But everything holds vacuum a long time. I ran it on Sunday and left it holding 24 inches and today, three days later, it only lost 8 inches.

Try a check valve right at the pump nipple.

Maybe you have a leaking booster.

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post #32 of 39 (permalink) Old May 15th, 19, 10:14 PM
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Re: Low Vacuum Options

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Originally Posted by lucifershammer View Post
How loud is the pump when it kicks on? Any chance you could post a video?
Here ya go!

It's not as loud as it seems to be in the video, It sounds like a fuel pump.

I think it's sounding through the fender. It would be quieter if I mounted it to the chassis or if I added a secondary rubber mount, in addition to the two the pump came with.

Regardless, my engine is loud and with it running, the vacuum pump can't be heard.

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post #33 of 39 (permalink) Old May 15th, 19, 10:43 PM Thread Starter
blm
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Re: Low Vacuum Options

Paul,
I read your post where you said your pump kicks on every time you step on the brake. I thought you said that was without a reservoir.
I d out my booster is leaking as it was just rebuilt and restored. I mounted the pump behind the bathere and then the reservoir behind the washer bottle. All there is between the pump and the reservoir is about 5 feet of vacuum hose and then it hooks dire tly to a Che k valve as it gets to the reservoir so that is in essence the same as having a check valve directly in front of the pump. The problem is as soon as I got done installing it I ran it for ten or 1t .inutes and then had to quit working on it and haven't been back to it. I think I have a leak as evidenced by the pump running after the car was shut off for t minutes and the brake was not stepped on. In that 5 minutes the reservoir lost its stored vacuum. I figure it out next time I work on it.
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post #34 of 39 (permalink) Old May 15th, 19, 10:57 PM
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Re: Low Vacuum Options

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I thought you said that was without a reservoir.

That's correct, I don't yet have my reservoir connected yet. I'm hoping it'll let me get one brake application without turning on the pump. Regardless, I won't care how much it runs, I won't notice it.

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post #35 of 39 (permalink) Old May 15th, 19, 10:57 PM
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Re: Low Vacuum Options

Quote:
Originally Posted by paul bell View Post
Here ya go!

It's not as loud as it seems to be in the video, It sounds like a fuel pump.

I think it's sounding through the fender. It would be quieter if I mounted it to the chassis or if I added a secondary rubber mount, in addition to the two the pump came with.

Regardless, my engine is loud and with it running, the vacuum pump can't be heard.

Brake pump - YouTube
It's not loud?

Bloody Hell...I think it set off the neighbor's car alarm.
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post #36 of 39 (permalink) Old May 15th, 19, 11:01 PM
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Re: Low Vacuum Options

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Originally Posted by DUTCH MAX HEADWORK View Post
It's not loud?

Bloody Hell...I think it set off the neighbor's car alarm.

Did you miss this:


Quote:
Originally Posted by paul bell View Post
It's not as loud as it seems to be in the video

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post #37 of 39 (permalink) Old May 15th, 19, 11:18 PM
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Re: Low Vacuum Options

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Originally Posted by paul bell View Post
Did you miss this:
No Paul, I'm pulling your leg because when you shut off the pump a car alarm is going off in the background.
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post #38 of 39 (permalink) Old Yesterday, 10:22 PM
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Re: Low Vacuum Options

OK Brad, I dd a little test today. The pump seems still runs with one application of the brakes with or without the reservoir can.

Without it, the brakes are more than acceptable, they are excellent. I'm leaving the can out.

I did notice one thing, the gauge very quickly gets to 25 inches and seems to sit there an extra 8 seconds or so before the switch shuts it off. I'm gonna adjust the switch down just a hair to see if it shuts the pump more quickly when it hits say 24 inches.

TODAY is the first time I registered and drove this car in 28 years! I forgot how loud it is. The vacuum pump can't be heard at all. If your car is quiet as granma's Buick, you'll hear it but again, it's not loud, it's like a fuel pump running.

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post #39 of 39 (permalink) Old Yesterday, 10:58 PM Thread Starter
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Re: Low Vacuum Options

Thanks for the update Paul. Im suprised but have never used a vacuum pump before. Seems as though the reservoir really serves no purpose. I still have not had a chance to work on it again but am wondering why my pump ran after the engine was shut off for several minutes without touching the brake and then turned the key on. To me that sounds like system lost its vacuum. Although I thought I was making good connections. Well guess I'll have to experiment a little.
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