Chapter 1 — What You’re Actually Solving

A sump pump has a working life of 7–10 years. If yours is at or past that, replacement on your schedule is cheaper than replacement at 2 AM during a storm.

Three reasons you’re replacing a sump pump:

• It’s dead. No sound when the pit fills, float switch stuck, motor burned out. You’re already reactive — the basement is either flooding or about to.
• It’s failing. Runs more than it should, cycles short, hums without pumping, discharges weakly. Past its prime but not dead yet.
• It’s old and you want to be ahead of failure. Pump is 8+ years old, you’ve learned the lesson from a previous basement event. Preventive replacement.

This book is about replacement. The reactive case (#1) is the same job but under pressure. Preventive replacement (#3) is the ideal case — do it on a dry day.

Check before replacing

Pump hums but doesn’t discharge water: Could be a clogged intake, stuck impeller, or the check valve failed (water that was pumped up falls back into the pit on every cycle). Check:

• Unplug the pump (safety — electric + water).
• Lift the pump out. Clear debris from the intake screen.
• Check the check valve in the discharge pipe (usually a few feet above the pump). Listen — you should hear it click when water is pumped past. If it’s noiseless or water audibly falls back, check valve has failed. Replace that ($15) before replacing the whole pump.

Pump doesn’t run when pit fills: - Float switch stuck. Lift the float manually — does the pump run? If yes, float is stuck; pull the pump and clean the switch mechanism. - Pump plugged in? Power at outlet? - If none of those — motor’s dead. Replace.

If you’ve ruled out the easy fixes, replacement is the answer.

What this book covers

• Sizing and selecting a replacement.
• Tools and materials.
• Disconnecting the old pump safely.
• Installing the new pump.
• Discharge plumbing (PVC with check valve).
• Float switch adjustment.
• Testing.
• Optional: battery backup system.
• Alarms and monitoring.

What this book doesn’t cover

• Installing a sump pit from scratch (new construction or retrofit in a basement that doesn’t have one). Major concrete work; specialist territory.
• French drain or interior drain tile systems. The sump pit is the terminus of those; installing the drainage is a separate project (see Diagnose a Wet Basement).
• Outdoor/lawn drainage sumps (yard-drainage pits). Similar principle, different install.

What you’ll be able to do by the end

Replace a submersible sump pump in 90 minutes on a dry Saturday. Install a battery backup in an additional 90 minutes if you want one. Verify the install with a water test.