Introduction: Vacuum Powered Liquid Extractor!

Picture of Vacuum Powered Liquid Extractor!

I always wanted an easier means to remove liquid when I'm doing car maintenance. By this I mean;
-removing power steering fluid.
-removing transmission oil.

-bleeding brakes.

Here is how I made this very convenient tool in less than half hour.

Step 1: The Liquid Air Separator.

Picture of The Liquid Air Separator.

This old water pump filter I decided to convert into my liquid air separator. The clear jar is perfect to let me see how much stuff I have removed. Also, it's pressure construction is important for the upcoming steps.

Step 2: Making an Output Connection Port.

Picture of Making an Output Connection Port.

I used a spare washing machine water hose to make an output connection. I cut a 2 inch length of hose. A 1/4inch nipple I threaded into the hose segment with the help of my spanner. I pushed it into the out port of the filter. The fit was nice and snug!

Step 3: The Input or Suction Connection.

Picture of The Input or Suction Connection.

Another hose segment I pushed into the IN Port of the filter. Using 3/8inch clear vinyl tubing, I pushed one end into the hose. The other end will be used to suck liquid.

Step 4: The Vacuum Source.

Picture of The Vacuum Source.

My trusty hvac vacuum pump will be used to generate the vacuum. Eventually I may have a dedicated 12volt vacuum pump to do the job but for now I will use the equipment I already have. I used a spare vacuum hose to couple the pump to the diy port on my liquid catch bottle.

Step 5: Testing!

Picture of Testing!

I used a bucket of water to do a quick test. Turning my vacuum pump on, the end of the vinyl tube sucked greedily at my finger. Good!

Putting the tube into the bucket now, the water was sucked rapidly! The level shown in the pic was pulled in less than 10 seconds!

The top can easily be unscrewed for me to dump the liquid!

In reality the viscous liquids I intend to remove will take longer to extract but I'm anxious for field trials.

Step 6: Completion!

Picture of Completion!

I'm pleased with the performance of my liquid catch bottle! To make it portable I put a carry strap secured via cable ties. I can't wait to bleed brakes now!


JAYINC11 (author)2017-04-01

What about a drill powered pump would that work? See here

sleepy58 (author)2016-11-06

so would a shop vac work if the connections could be altered to fit? lol I don't have a vacuum pump but need to replace the transmission fluid in our 4-runner and it has a sealed transmission so no dip stick and really don't want to invest in the hvac pump. I guess a shop vac would be considered a 1 stage pump if my thinking is right lol maybe

Mjtrinihobby (author)sleepy582016-11-06

A standard vacuum cleaner is not good for liquid extraction. It pulls too low a vacuum and it is too noisy. Your best best is a low cost hand pump extractor. I had one but gave it away after creating my wonderful diy extractor.

sleepy58 (author)Mjtrinihobby2016-11-07

thanks for replying I knew I was off track with the shop vac idea but needed someone with better knowledge to tell me it wouldn't work. lol Wife says I'm too frugal to put it nicely so I'll invest in a 2 stage pump thanks again

TEAMPANIC42 (author)sleepy582016-11-14

You may be able to rent the vacuum pump at a nearby auto parts store.

Mjtrinihobby (author)TEAMPANIC422016-11-14

good point!

TEAMPANIC42 (author)2016-11-14

This is a brilliant idea. Thanks for this.

Mjtrinihobby (author)TEAMPANIC422016-11-14

Your welcome!

JayWeeks (author)2016-09-29

What model of vacuum pump do you use?

Mjtrinihobby (author)JayWeeks2016-09-29

Any 2 stage HVAC pump will work fine. Even a cheaper 1 stage will do the job. All depends on your budget.

About This Instructable




Bio: As of April 2017 I have decided to no longer post on instructables. The fact that several of my published works have been removed without ... More »
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