Collection: SPX FLOW

Renowned for advanced impeller technology and other key innovations, Johnson Pump Marine (part of the SPX FLOW group) drives forward pump engineering for the marine application segment.

Serving both leisure and commercial vessels, Johnson Pump Marine manufactures high-efficiency products for either initial OEM fitting-out or subsequent after-market installation. Among these items are bilge pumps, fuel transfer pumps, engine cooling pumps, circulation pumps, emergency pumping equipment, clutch pumps, wastewater and toilet handling pumps, drainage systems, high-pressure deck-washing kits and water pressure systems, plus numerous other related accessories and fittings.

Johnson Pump - Bilge Pumps

All you need to know about SPX-Flow products

Frequently Asked Questions

My pump is Centrifugal, what does that mean?

entrifugal pumps use momentum of the spinning impeller in contact with a fluid to transfer the rotating force into the fluid and outward through the discharge port. These types of pumps are used in applications where self-priming capabilities are not critical, and water pressure is already supplied to the pump by gravity (gravity fed) or continuously primed via a source such as a seacock or fluid and pump below the waterline.

My pump is Self-Priming, what does that mean?

- Self-priming means the pump can draw fluid through the system without any assistance from another pump, gravity, or primer bulb.

- Most cases, this is likely a Flexible Impeller Pump (FIP) or Diaphragm pump. The trick is suction contained within the geometry of the pump design.

Why Does my centrifugal pump motor hum, vibrate, and surge, but no water is coming out of the discharge?

It may be possible the pump is not fully submerged, or the pump is incorrectly oriented or applied in the system.

See Air-binding/ Airlock.

- All Johnson Pump Bilge/Aerator cartridge, Proline, Ultima, and Heavy-Duty bilge pumps require near vertical orientation in order properly evacuate water from the bilge.

- Aerators with thru-hull connections below the water line can be oriented at slightly more aggressive angles as they receive as from a location below the water line, or about 1inch of fluid height.

I think my pump is Air-bound or air-locked, what do I do?

Air binding or airlock is typically a result of air or gasses being trapped in the system either downstream of the pump, or at the impeller, that cannot be passed during operation. This causes the motor to spin, hum, and vibrate, but no water or fluid can be pumped from the discharge line. Remember, the pump is designed to pump much more dense fluids, not air or gasses.

- Make sure all connections on inlet and discharge are tight

- Make sure discharge line is as straight as possible, or on a continuous linear incline; no dips, valleys, sags, or bends and as short as possible.

Adjusting the discharge line may relieve the pump from being air-bound by releasing gasses or air from the impeller and system.

What type of grease is recommended for the motor cartridge o-ring?

Motor Cartridge o-rings are installed with FOOD-GRADE Grease (NSF H1) as they are being used in the marine environment for aquatic life safety. The O-ring is of nitrile/NBR material. Other Food-Safe petroleum-based lubricants or oils can be used as well. Vaseline or other household petroleum jellies are not recommended as they can contain acids that degrade the o-ring material over time.

Are the replacement cartridge motors used in the 500|700|1000 GPH Bilge pumps the same as their sibling Aerators?

The cartridge motors are the same for their sibling items and can be purchased from Johnson Pump retailers and dealers.

Will my Cartridge bilge pump housings accept the other sized replacement cartridge motors?

The cartridge housing containing the 500, 750, and 1000 GPH motors can be interchanged, however flow may be impacted depending on the installed combination of motor and impeller.

What about 1250GPH motor and cartridge housing? Can it be interchanged?

The 1250gph housing is different compared to the 500|750|1000 GPH housings. Although it can accept the same motors, the housing does not have the same port and hose connection sizes and will require timely system modifications to make it work in existing bilge/aeration systems. Additionally, flow is determined by the installed combination of motor and impeller as well.

Can I rotate the base of the Cartridge Aerator that uses the 90° Thru-hull fitting to make inlet/discharge locations more desirable?

Although physically it is possible, it is not recommended to unscrew and rotate the cartridge bilge/aerator housing 180°. Reason being the metal screws are self-forming threads into the plastic housing in the currently installed state. Disassembly and reassembly may jeopardize the thread integrity and seal at the joint.

What size is the Aerator Thru-hull/ Inlet?

The Thru-hull is ¾”-14 NPSM.

What size is the Cartridge Series discharge outlet?

The cartridge series discharge outlet is ¾”-14 NPSM.