Powerful Water Pump




About: How to Everything.


In this instructable I am going to built a water pump that is powered by 12 volt 2Amp battery. The idea behind this whole instructable is to built a good quality water pump out of very common hardware lying around. Its time to ready get set built !!!

Screwdriver set 1.99$

microscopes-endoscope 6.1$

pliers 7.99$

other-tools 0.99$

Step 1: Components

As all my other projects, this project is also based on very common materials that are available from any hardware store.So the list of the required material is :

18v DC motor

50 X 32 mm PVC Reducing coupling

50 mm cap

32 to 20 mm reducer

6 X 6 cm 1 mm thick aluminium sheet

5mm thick plywood sheet

bike tire tube

A bunch of head screw

Tools :

Drill Machine and bits

Screw driver


aluminium cutter

Step 2: Make Main Chamber

The whole idea is based on the design of centrifugal in which an impeller revolves arround an enclosed housing so that when the impeller revolves, it forces the water outwards which then flows through the output pipe on the housing.

So the whole pump is based around the 50mm PVC end cap which acts as an enclosure or for the impeller that actually forces the water out of the pump.The motor is also mounted on the PVC cap by using two screws.Later on the PVC cap is glued to the base using some plywood supports.

So Lets make Enclosure.

1) Mark sign to end cap for drilling hole

2) Drill two hole using 3 mm drill bits and main hole using 12 mm drill bit.

3) cut Some portion of end cap as per picture.

Step 3: Cut Reducer

Take 30 X 50 mm Reducing Coupling and cut 1 cm portion from 50 mm side.

Cutting of Cap & Reducer due to the maintain length of pump.

Step 4: Outlet Hole

To make an outlet, I have used a 1/2 Inch PVC pipe that i got from Hardware shop. Which is sufficient size outlet for this water pump.The outlet pipe is mounted such that is is much like a tangent on the surface of the impeller housing which helps the water flows more easily out of the pump.

1)Take 1/2 inch pipe and cut 3 cm length in the shape of ellipse.

2) Mark the sign on Reducer.

3) Drill hole using drill machine & Other portion of plastic cut with cutter.

Step 5:

Step 6: Outlet Joint

Take Reducer and paste some glue on wall of outlet hole.

Then Take outlet pipe and stick with outlet hole.

Step 7: Make Coupling for DC Motor

Take Syringe and Cut 2 cm from outlet.

Step 8: Make Proppeler

The whole idea is based on the design of centrifugal in which an impeller revolves arround an enclosed housing so that when the impeller revolves, it forces the water outwards which then flows through the output pipe on the housing.

To make this Impeller Follow this step.

Step 9: Make Vacuum Seal

Take Bike Tire Tube end cut Round Shape of this tube.

Make 3 hole as per you cut on end cap.

Step 10: Assemble All Component

First the motor was mounted to the main housing. Then impeller is mounted on the motor shaft by just pushing it on the shaft.

1) Place Vacuum tube and screw down the end cap and to ensure that no water leakage takes place.

2) Then impeller is mounted on the motor shaft by just pushing it on the shaft.

Step 11: Test This Impeller

Take 9 volt battery to just test impeller rotating without any contact or not.

Step 12: Close the Housing

Close the end cap using 50mm pipe to reducer and paste some hot glue for no water leaked.

Then Take lbow and joint to uotlet.

Step 13: Fitting on Wood

Take 1 cm thick wooden plate and fit water pump.

Step 14: Test

Enjoy This water pump.

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    12 Discussions


    Question 1 year ago

    any chance you have hooked this up to one of those hose pressure guages to see how much pressure it can generate?


    1 year ago

    How is this pump primed? Can the impeller create a sufficient vacuum to draw water up?

    Spaceman Spiff

    1 year ago on Step 14

    I like it! Have you tested it's performance in quantity per hour?


    1 year ago

    Design. Take apart some pumps. you will benefit from hundreds of years of development.

    Presentation: This is on of the best step by step instructions I have seen. Excellent presentation, truly well done how-to.


    Question 1 year ago

    I don't have enough physics knowledge to calculate myself. What is the highest point to where the water can be pumped.



    Question 1 year ago

    Seal from pressure chamber to motor shaft:

    I understand the vacuum in the shaft area while the impeller is rotating. However, on shut down, liquid will tend to leak back through the rubber seal, even though it is semi tight when the assembly is new. I suggest the rig be assembled in such a way the motor drives an impeller shaft through a coupling, keeping the motor some distance from the housing. This shaft could be eliminated with a longer shaft motor, or a belt drive of some sort removing the motor from the impeller chamber. Also, it would be helpful if the motor was located above the impeller housing, as in a vertical arrangement, thus preventing leaks at the shaft from running back into the motor. The design as is, is very well thought out for assembling a pump in a critical and probably (hopefully!) temporary situation. I like the simplicity, the easy construction with a minimum of precision tools, and the design would probably run for many hours reliably. Even as it is, if one were to be careful during shutdown and start up, I see no reason for much of a seal at the motor/impeller shaft. Proper care to dry the motor after use and keep it lubricated should prevent any real damage due to water or other non-corrosive or flammable liquids.

    I think this is really an awesome project that give valuable information for helpful products in cases of emergency.

    Thank you for posting this. It's a Good Instructable! I would have liked to see a photo of the finished impeller after it was attached to the shaft. How much vibration did it suffer in operation, etc. Do you have a video fo it in operation?


    Question 1 year ago

    Something tells me that the bushing/seal around the shaft of the motor isn't waterproof. How long have you had this motor running?

    2 answers

    Answer 1 year ago

    A slight vacuum but what when it sits ?


    Answer 1 year ago

    Perhaps, while the motor is running there is a vacuum around the axis of the impeller shaft so there is no pressure pushing water into the motor. This is the same vacuum that providing suction on the input side.


    1 year ago

    So you failed to show the completed impellor (now fixed) . Its shape is the important part? I agree water will work its way into the motor


    1 year ago

    About the syringe, this is a very good idea ! I'm gonna try this instead of these expensive couplers.