Johnson Pump 40004 Heavy Duty 4000 GPH 12V Bilge Pump

The Johnson Pump 40004 is a heavy duty 12V bilge pump built to move up to 4000 GPH of water, engineered to exceed both commercial and recreational demands aboard a boat. At the core is a 12-pole motor with double ball bearings for extended service life, paired with a stainless steel shaft and liquid cooling to keep the motor running cool during extended operation. The impeller is designed to maximize flow and head, delivering 4000 GPH in a straight discharge and 2600 GPH at a 1.0 meter head. A universal base plate gives installers a choice between two different ports, simplifying mounting in tight bilge spaces. The pump housing uses high impact ABS plastic together with a mechanical shaft seal and a unique threaded port design for a durable, leak resistant build. A removable check valve is included to prevent backflow once installed. The 40004 draws 15 amps and is recommended for use with a 25A fuse, with a 16 gauge wire run of 6 feet supplied. Connections accommodate 1-1/2 inch and 2 inch hose sizes. For automatic operation, this bilge pump can be combined with an electronic float switch or an Ultima style switch, letting it turn on and off based on bilge water level without manual intervention.

Specifications

• Brand: Johnson Pump
• Manufacturer Part Number: 40004
• Type: Bilge Pump
• Voltage: 12 volts
• Flow Rate (Straight): 4000 GPH
• Flow Rate at 1.0m Head: 2600 GPH
• Amperage Draw: 15 amps
• Recommended Fuse Size: 25 amps
• Hose/Port Connection: 1-1/2 inch and 2 inch
• Wire Size: 16 gauge
• Wire Length: 6 feet
• Shaft Material: Stainless steel
• Body Material: High impact ABS plastic
• Color: Black
• Dimensions: 6.5 inches L x 8.5 inches W x 9.1 inches H
• Weight: 6.3 pounds
• Motor: 12-pole motor with double ball bearings
• Cooling: Liquid cooled
• Check Valve: Removable, included

Frequently Asked Questions

What is the flow rate of the Johnson Pump 40004 bilge pump? The Johnson Pump 40004 delivers 4000 GPH in straight discharge and 2600 GPH at a 1.0 meter head, making it a heavy duty bilge pump suited to commercial and recreational demands.

What voltage does the 40004 bilge pump run on? This bilge pump runs on 12 volts and draws 15 amps, with a 25A fuse recommended for the circuit.

What hose sizes fit the Johnson Pump 40004? The 40004 uses a universal base plate with a choice of 1-1/2 inch or 2 inch port connections, allowing flexible installation depending on existing hose runs.

Can the Johnson Pump 40004 be used for automatic bilge operation? Yes, the 40004 can be combined with an electronic float switch or an Ultima style switch to turn the pump on and off automatically based on bilge water level.

What is the 40004 bilge pump made of? The Johnson Pump 40004 uses a high impact ABS plastic body with a mechanical shaft seal and a stainless steel shaft, plus a liquid cooled 12-pole motor with double ball bearings for extended service life.

Does the Johnson Pump 40004 include a check valve? A removable check valve is included with the 40004 bilge pump to help prevent backflow once it is installed.

What are the dimensions and weight of the 40004 bilge pump? The Johnson Pump 40004 measures 6.5 inches long by 8.5 inches wide by 9.1 inches high and weighs 6.3 pounds.

What wiring does the 40004 bilge pump come with? The 40004 is supplied with 16 gauge wire in a 6 foot length.

Is the Johnson Pump 40004 designed for continuous submerged use? The 40004 features a liquid cooled motor with double ball bearings and a mechanical shaft seal, construction intended for demanding bilge pump duty aboard a boat.

What color is the Johnson Pump 40004 bilge pump? The Johnson Pump 40004 has a black high impact ABS plastic housing.