How to Replace a Bilge Pump

It seems that something is always in need of replacement or fixing on a boat. The old saying "a boat is a big hole in the water you throw money down" is not quite true, but it's close. One safety device that is very important to keep in good working order is the bilge pump. With one in proper working order, even small leaks in your boat can be handled and stopped in time.

Things You'll Need

• Screwdriver
• Wrench
• Waterproof sealant like 3M 5200
• Wire cutters
• Crimp connectors
• Crimping tool

Instructions

1. Locate the bilge pump. The pump is located at the lowest point on the hull. The water will collect there and the pump can pump it back outside the hull into the water.

2. Unbolt the bilge pump from the side of the hull. Inspect the hole for cracks or breakage and repair if needed. Leave the wires from the bilge pump intact, as you will be attaching the wires from the new pump to the same places.

3. Locate the new pump at the same place you removed the old one from. Line the bolt holes and section of the pump head that connects to the hull with a waterproof sealant compound to make sure it is water tight. A good compound is 3M 5200.

4. Hold the pump up against the hull while someone is bolting the pump to the hull. Before putting the bolts in the pump to attach it, line the bolt holes and coat the bolts with the sealant to ensure no leaks and bolt the pump to the hull.

5. Trace the wires from the old pump to the controls at the panel. The color coding should be the same. One at a time, cut a wire and patch it into the existing wire. Use crimp connectors to form the new connection. When all the wires have been changed, the old pump should be able to be removed and disposed of.

Tips & Warnings

• Be sure not to put the boat in the water until the sealant has cured. The directions of the sealant that you used will tell you how long you should wait before the seal is cured and usable.

Resources

• Bilge pump wiring
• Basic boat repair