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Used punctually, lift pumps tend to scale up. Placed in the bottom of a collector system, they corrode and become blocked. Their reinstatement then requires a total revision.

revision of a lifting pump

A lifting pump (or vacuum pump-cellar) prevents infiltration, evacuates water from a flooded cellar or a congested sump and can also drain a pond. In the case presented here, the pump rests at the bottom of an external well communicating with the receptacle of the cellar. A switch in the float starts the pump as soon as a minimum water level is reached.

Check the operation

The base of the pump is constantly immersed in standing water. It is therefore common for corrosion and scaling to settle in the turbine housing, preventing it from rotating.
To check its operation, simply fill the water well. The float switch rises with the level and when it is in the up position, the motor of the pump must start rotating and the water flow through the discharge pipe.
If the pump does not work, a revision is necessary.

Establish a diagnosis

Before handling, the power must be turned off and the electrical connections disconnected at the junction box at the top of the well. The pump is brought to the surface thanks to its chain.
Although it is mainly made of stainless steel (engine and turbine), the rust develops at the level of the cast iron sump. When trying to turn the propeller manually through the water suction hole, it is found that it is blocked. The presence of rust and scaling of the propeller explain the blockage and the breakdown. A deterioration of the contactor-float is discarded.

Surface mechanical brushing

After having cleaned and eliminated the external rust, the turbine must be out of its housing, with which it has joined. You must first remove the bottom plate with a central hole for aspiration. The turbine is associated with the motor shaft by a flat and an axial screw. Flakes of rust appear inside the housing, which must be removed by scratching and energetic brushing.
After reassembling the elements, a test run can be done without water: the pump is switched on, by manually placing the switch in the high position, we must hear the engine running.

scraping the pump

  • Take the pump out of the well.
  • Scrape off the turbine housing from the triangle and wire brush.
  • It is also possible to work with a metal bath brush mounted on a drill.

anti-tartar application

  • An effective way of removing scale from the pump body is to apply a solution of equal parts of hydrochloric acid and water.
  • Leave on for thirty minutes and rinse thoroughly.

unscrewing the plate and the feet of the pump

  • Remove the bottom plate (or flange) which ensures the suction of water through its central hole.
  • Use an Allen wrench, unscrew the three screws that tighten the plate and the feet of the pump.

scratch the inside of the housing

  • Remove the turbine by removing the central screw.
  • Then pull in the axis until removal.
  • Scrape the inside of the housing with a knife, brush and grease to protect the cavity from rust.

make a rotation test

  • Reassemble the turbine by engaging its flat on the motor shaft.
  • Tighten the axial screw while holding the turbine stationary, using a vice clamp for example.
  • Make a rotation test.

crankcase protection

  • Protect the crankcase and after degreasing with white spirit, brush with two coats of lead-free minium six hours apart.
  • Leave to dry for twenty-four hours.

replace the pump

  • Reassembly of the pump base continues by replacing the lower flange and O-ring between this part and the housing.
  • The three hexagon screws join the feet, the flange and the housing.

repaint the pump in blue

  • The pump, repainted with its original blue color, is like new.
  • Clean the large corrugated discharge pipe and ensure a good connection with the outlet pipe by equipping it with a stainless steel pipe clamp.

Tips for DIYers

- It is recommended to reassemble the pump and wash it with a jet of water or a pressure washer regularly. A test run after power-up and action on the float switch completes the service test.
- It happens that the blocking of the motor causes the destruction of the starting capacitor. If inflated or deformed, change it to an identical one: often 32 μf, 450 V operating voltage.

Revision of a lifting pump

FAQ - 💬

❓ What are the limitations of a lift pump?

👉 Depending on the cylinder size and the depth of the lift pump cylinder, manual pumping can be challenging. Lift pumps that utilize plastic parts can only pump water from a limited static water level before the plastic breaks because of the weight of the water and the pump parts.

❓ What is the difference between a lift pump and a force pump?

👉 The only difference between this and the simple lift pump is that the lift and force pump has a stuffing box around the pump rod at the top of the pump body to prevent water from flowing out that way. (See Figs.

❓ What is the main purpose of a lift pump?

👉 What is a Lift Pump? A lift pump can be defined as a low-pressure pump whose core functions is to transport fuel to a high-pressure pump. In older engines, fuel pressure is directed into the injection pump where higher pressure boosts it through an injector.

❓ Does a lift pump improve performance?

👉 When You Need One. Anytime you plan to pursue more power than what your truck made in stock form, a lift pump is a good idea. Because the injection pump and injectors are arguably the most vital components in a diesel engine, keeping them supplied with plenty of fuel keeps them cool, lubricated and functioning properly ...

❓ Why airlift pumps are not necessary nowadays?

👉 Conventional airlift pumps have a flow rate that is very limited. The pump is either on or off. It is very difficult to get a wide range of proportional flow control by varying the volume of compressed air. This is a dramatic disadvantage in some parts of a small wastewater treatment plant, such as the aerator.

❓ What are the disadvantages of pump?

👉 Disadvantages of Pump: Produce cavitation. Corrosion. Cannot be able to work at high speed.

❓ Will a diesel engine run without a lift pump?

👉 If you have a stock truck with no desire to add horsepower, then sure, the engine can run fine without a lift pump for a long time. But just because it can doesn't mean it should. If you compare the CP3 in the Duramax to the CP3 in the Cummins, the one on the Duramax has to do a lot more work.

❓ Is a lift pump and fuel pump the same?

👉 What is a lift pump? Basically, it's a fuel supply pump that takes fuel from the tank and transfers it to the injection system.

❓ What is the difference between a lift pump and a fuel pump?

👉 Fuel Pump: What's the Difference? With diesel applications, the low-pressure fuel pump is typically referred to as a lift pump or transfer pump to differentiate it from the high-pressure injection pump. Typically, the lift pump is used to provide a steady feed of air-free fuel to the high pressure pump.

❓ What are the symptoms of a faulty lift pump?

👉 Let's take a look at three signs that indicate a failing diesel fuel lift pump.

  • The engine stalls. ...
  • The engine overheats. ...
  • You're hearing weird noises.

❓ Does a lift pump increase mpg?

👉 Registered. A lift pump is not going to give you any better fuel economy unless you have fuel issues already. Same as when you put additive in your tank, no better fuel economy unless you have fuel issues.

👉 Typically installed in trucks with diesel engines, the lift pump essentially builds pressure or suction in the gas tank, which causes fuel to rise to the injection system and engine. Fuel pressure from the lift pump is further pressurized by the high-pressure injection pump or unit injectors, which typically increase pressure to thousands of psi.

👉 Just like fuel pumps, lift pumps can either be mechanical or electric. Let’s take a look at how these two types differ. Mechanical lift pumps have fixed fuel pressure and volume. This type is typically used in old OEM applications. Unlike the mechanical lift pump, this type may have flexible fuel pressure and adjustable volume.

👉 We know that the pump must generate 15 feet of lift at the pump suction, lift is negative static head. It should in fact be slightly more than 15 feet because a higher suction lift will be required due to friction. But let’s assume that the pipe is generously sized and that the friction loss is small.

👉 That means your engine has all the fuel it needs to make maximum power when you need it the most. In some cases, you can increase the amount of fuel pressure and flow to the engine by upgrading your lift pump. This often leads to power and performance gains.


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