How to Replace a Submersible Sump Pump

How to Replace a Submersible Sump Pump

Advanced
6 hours
7 Steps
28 items

This project involves safely disconnecting and removing an old submersible sump pump from a sump pit, preparing and installing a new pump, connecting it to the existing discharge plumbing, and testing its operation to ensure it effectively prevents basement flooding.

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Best for experienced DIYers and homeowners with some experience with basic plumbing knowledge. Requires Klein Tools Non Contact Voltage Tester Pen, 50 1000V AC (NCVT1PR) NCVT1PR.

Tools & Materials

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G & F Products 1628 L 100% Waterproof Winter Gloves for Outdoor Cold Weather 1628L

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Safety glasses feature a well thought-out construction that combines the best in safety, comfort and affordability. Your vision is unobstructed by the 1-piece wraparound lens which, by its tight fit, provides for maximum safety. Flexible temples enhance your comfort during extended use. Nonslip rubber head grips are notched for a clip-on breakaway cord.

Klein Tools Non Contact Voltage Tester Pen, 50 1000V AC (NCVT1PR) NCVT1PR

Klein Tools Non-Contact Voltage Tester detects standard voltage in cables, cords, circuit breakers, lighting fixtures, switches, non tamper-resistant outlets and wires. A bright green LED indicates the

Common Problems

The pump may start abruptly when the float is lifted. Keep hands and loose clothing away from the pump's intake.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Pump fails to turn on or off, causing basement flooding.

Solution: You can manually test the float switch by lifting it up to ensure the pump turns on and then releasing it to ensure it turns off.

Ensure the outlet is a Ground Fault Circuit Interrupter (GFCI) outlet for safety in potentially wet locations.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

The outlet for a sump pump should always be a Ground Fault Circuit Interrupter (GFCI) outlet for safety.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

Always use a GFCI outlet for sump pumps to protect against electrical shock.

Solution: To avoid this issue: Be mindful of this warning and take appropriate precautions.

The sump pump won't turn on or off correctly if the float switch is obstructed.

Solution: Double-check that the float switch can move fully up and down without hitting the pump or the side of the pit.

Pump won't turn on or off, flooding the basement.

Solution: Double-check the float switch's path of travel before finalizing the pump's position.

Frequently Asked Questions

What is the single most critical safety precaution I must take before starting to replace my submersible sump pump?

Always disconnect power to the sump pump circuit by unplugging it or turning off the dedicated breaker at your electrical panel. This prevents accidental electrocution, especially since you'll be working with an electrical appliance in a potentially wet environment. Confirm the power is off using a voltage tester if you're unsure.

Yes, a beginner can successfully replace a sump pump, but taking your time is key. Factors like rusted or seized discharge pipe connections, a very dirty sump pit requiring extensive cleaning, or unexpected plumbing modifications can extend the project beyond 6 hours. Having all your tools and materials ready beforehand will help streamline the process.

While the listed tools cover the basics, a shop vacuum can be incredibly useful for thoroughly cleaning out a dirty sump pit before installing the new pump. Additionally, a hacksaw or reciprocating saw might be more effective than a PVC cutter if you encounter old, rigid, or difficult-to-reach piping that needs to be cut.

Before purchasing, measure your old pump's dimensions (height, width), horsepower (HP), and discharge pipe diameter (commonly 1.25" or 1.5"). Also, note the type of float switch (tethered or vertical). Matching these specifications will ensure your new pump fits properly in the sump basin and connects easily to your existing plumbing.

A common mistake is not ensuring the float switch has full, unobstructed movement within the sump pit. If the float gets stuck against the pit wall, the pump may fail to turn on, leading to flooding, or it may not turn off, causing the pump to run continuously and burn out. Always test the float manually several times before securing the pit cover.

It is highly recommended to replace old galvanized steel discharge piping with PVC when installing a new pump. Steel pipes can rust, corrode, and restrict water flow, compromising the new pump's efficiency. You'll need appropriate transition fittings (e.g., a galvanized-to-PVC adapter) and plumber's tape or sealant to ensure a watertight connection.

To thoroughly test, fill the sump pit with several gallons of water using a bucket (like the Unger 6 Gal. Heavy-Duty Plastic Bucket DB02). Observe that the float switch activates the pump, the water discharges effectively through the pipe, and the pump shuts off cleanly once the water level drops below the 'off' point. Repeat this two or three times to confirm consistent operation.

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6 hours | 7 Steps