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Water Pump FAQs

Water Pump FAQs

  • What is a portable water pump?

    A portable water pump is an outdoor power tool that utilizes a centrifugal pump to move a large amount of water rapidly.  A gasoline-driven engine will drive an impeller inside a pump to create a flow of water between a source and the intended location. The source of water can vary from ponds to lakes, swimming pools, ditches, standing containers, and more.  The intended location can be just as varied.

  • What is GPM, Vertical Suction Lift, Max Total Head, and why are they important?

    GPM stands for “gallons per minute,” and describes how much water is flowing through the water pump.

    Vertical Suction Lift is how far up the pump can be from the top of the water. This is the distance that the water from the source is lifted to the pump itself. 

    Maximum Total Head Lift is how far up (away) the pump can push the water. This is the total distance from the top of the water source to the discharge location.  

    For best use, have the pump as close as possible to the water source. 

  • How do I select the right water pump?

    It all depends on how much water you need to pump, how quickly you need to pump it, and how dirty the water is. A pump’s performance is determined by many factors such as atmospheric pressure (how high the pump is above sea level) resistance from hoses, etc. A pump’s performance is measured in flow and expressed in gallons per minute or gallons per hour. The higher the flow, the better the performance. If the water is sandy, muddy (abrasive), or has small particulates, you should purchase a semi-trash or trash pump. If the water you intend to pump is always clean, such as in a swimming pool, hot tub, or water garden, a clean water pump will be fine.

  • Do the water pumps have to be maintained?

    All water pumps require periodic maintenance, such as oil changes to ensure maximum performance for years of reliable service. Refer to the owner’s manual for routine maintenance procedures and schedules.

  • What type of oil should I use in my water pump?

    An SAE rated high detergent oil that meets API Service Class SF requirements for gasoline engines, similar to your car. Refer to your owner’s manual for details. To find your owner's manual online, visit our Product Support page and enter your serial number or model number. 

  • How do I store my water pump for the winter?

    Long-term storage is important, especially in the winter. Be sure to allow the pump and hoses to fully dry out prior to storage. Full long-term storage instructions are included in the unit’s manual. To find your owner's manual online, visit our Product Support page and enter your serial number or model number.

  • Can I pump hot water with my water pump?

    No, water must be no more than 100°F. Hot water can cause permanent damage to the pump.

  • Can I pump bleach with my water pump?

    No, bleach can cause permanent damage to the pump and hoses.

  • I no longer have my Owner’s Manual. How can I get another copy?

    Owner’s manuals and other documentation can be downloaded from our Product Support Page using the unit’s serial number, or contact us for further assistance.
  • If I have a problem with my water pump, where do I go for help?

    Any Authorized Generac dealer can perform warranty service. To find your local authorized Generac dealer see our locator or contact us for additional information. Our Authorized Service Centers provide parts, service and information on Generac equipment, regardless of where it was purchased. Authorized Service Centers are staffed with trained technicians certified in supporting all aspects of the Generac water pump line.

Online Product Support

Looking for more? In Generac's Online Product Support section you can find the specifications, product manuals, frequently asked questions, how-to videos, and more for your product.