Flojet Pumps

Learn the Basics of Flojet Pumps

The Flojet pumps we offer are broken down into two primary types: air operated diaphragm pumps and electric diaphragm pumps. While there are several pump details and variables that you eventually have to figure out, knowing the difference between the two basic pump types is where you should start.

Air Operated Diaphragm Pumps

Car washes use Flojet air pumps for low-pressure services like tire cleaners, presoaks, foam, and soaps. Air pumps are also used in other industrial environments where potentially harmful chemicals are used. They are an economical replacement for electric pumps when you can’t run electrical wires because it’s either impossible or unsafe to do so. AOD pumps feature compact, simple designs that use compressed air as a power source, so they are less susceptible to combustion and can operate when submerged. Flojet air diaphragm pumps can run dry and are self-priming.

Electric Motor Driven Pumps

Electric pumps are most frequently used for heavy-duty water transfer, spraying, and dispensing. These quietly operating pumps are available in a variety of voltages to suit your particular needs. Options include 12, 24, 36, 115, and 230-volt. Electric diaphragm pumps produce no emissions, so they are better for the environment and safer to use in confined spaces. Small electric motors within the pump housing make them compact and easy to fit into spaces. Electric diaphragm pumps are capable of running dry and are self-priming.

Important Specifications to Know When Buying Flojet Pumps

When selecting a Flojet water pump for your system, it’s essential to evaluate a few key specifications to ensure you get optimal performance and long-lasting reliability. To help you make an informed choice, consider the following important factors:

• Flow Rate (GPM): The gallons per minute (GPM) rating tells you how much water the pump can move. Choose a flow rate that matches your application’s demand, whether for car wash bays, chemical dispensing, or water transfer.
  
• Pressure Rating (PSI): Different tasks require different pressure levels. Make sure the pump’s maximum PSI is suitable for your end use—higher PSI pumps are ideal for applications needing strong water jets or foam.
• Power Type & Voltage: Flojet pumps are available in air-operated or electric models. Electric pumps come in voltages like 12V, 24V, 115V, and more. Verify power compatibility with your available supply.
• Chemical Compatibility: Pay close attention to the material options for diaphragms, seals, and check valves. Choose pump materials that will withstand the pH and corrosiveness of your chemicals to extend lifespan. For example, the most popular materials used for Flojet diaphragms are Santoprene, Viton, and Kalrez (FFKM). Santoprene is suitable for general purposes, Viton has a greater array of chemical compatibility, and Kalrez is selected when dealing with highly aggressive and corrosive chemicals, such as strong acids, caustics, and chlorinated hydrocarbons.
• Port & Fitting Sizes: Confirm that the inlet and outlet port sizes match your current plumbing and fittings for a seamless installation. Common options include 1/2", 3/4", and 3/8" hose barbs.
• Pump Duty Cycle: Consider whether your pump will be running intermittently or continuously. Choose a model rated for your required duty cycle to avoid premature wear.
• Mounting Configuration: Select a pump with mounting options that fit your equipment layout, helping reduce vibration and make future servicing easier.
• Self-Priming & Run Dry Capabilities: Especially important for car wash and RV applications, self-priming and run dry features prevent damage and ensure reliable operation even if water supply briefly stops.

By understanding these core specifications, you’ll be able to confidently select a Flojet pump that meets your needs and delivers dependable service in demanding environments.

Most Popular Series from Flojet

Flojet pumps are separated into several series that target different applications. They feature varying designs, PSI and GPM capability, diaphragm and seal materials, and other specification options. Not sure exactly what pump you’re looking for? Read this Flojet guide in our blog to learn more about the most important series.

• G57
• G70
• G71
• Duplex II
• VersiJet
• Triplex
• LF and LF Plus
• N5100

Adjusting the Air Pressure on a Flojet Pump

For air-operated pumps like G57 models, there is no pressure adjustment on the pump itself. Instead, you adjust the incoming pressure from your compressed air source using a regulator to keep it within the accepted range of your pump (usually about 20-100 PSI). Most Flojet electric diaphragm pumps, however, can be adjust with a built-in screw. Here's a general step-by step-guide to help:

1. Turn off power: Disconnect the power to the pump by flipping the breaker or switch.
2. Access the pressure switch: Remove the cover on the pressure switch to locate the adjustment screw.
3. Identify the screw: The central screw, often between the electrical terminals, is the pressure adjustment screw. Some switches may also have a second nut or screw for adjusting the differential pressure.
4. Adjust the pressure: To increase pressure, turn the adjustment screw clockwise. To decrease pressure, turn the adjustment screw counter-clockwise.
5. Fine-tune (if needed): If the pump cycles frequently, you may need to adjust the bypass valve in combination with the pressure switch to prevent short cycling. Adjust the bypass valve by turning the screw to a position where the pump turns off smoothly when a faucet is closed.
6. Test the pressure: Restore power to the pump and open a faucet to check the new pressure. You may need to repeat the adjustment process until the pressure is satisfactory.

While these steps provide a solid understanding of how to adjust the pressure on your electric diaphragm pump, you should always consult operation manuals and maintenance guides that came with your pump - both for safety and performance.

How to Tell if an RV Pump is Bad

Diagnosing a faulty RV water pump involves looking for several key warning signs that indicate performance issues or impending failure. The most common symptoms include weak or inconsistent water flow, odd noises like squealing or clicking from the pump, and water leaks near the unit or its fittings. If your Flojet pump cycles on and off even when you’re not using water, or if it fails to turn on altogether, these are additional red flags. Reduced pressure at faucets and showers may point to a worn-out diaphragm, clogged valves, or internal damage in the pump. You should also check for visible corrosion around electrical connections, as this can cause unreliable operation. Addressing these issues promptly helps avoid an unexpected shutdown, ensures consistent access to water in your RV, and protects other plumbing components from damage caused by leaks or surges in pressure. If you suspect your water pump is malfunctioning, refer to your owner’s manual and consider using Flojet OEM repair parts to restore reliable performance and avoid costly downtime on the road.

Popular Flojet Diaphragm Pumps for RVs

Here are some of the top-selling pump models used for RV applications. We also offer complete systems that include an accumulator tank.

• 04406143A Quiet Quad - 12V, 3.2 GPM
• 04406043A Quad II - 115V, 3.3 GPM
• R3526144D Three Chamber Triplex - 12V, 2.9 GPM
• D3131V5011A Duplex II - 12V, 1.6 GPM
• 18550000A RV Waste Macerator Pump - 12V, 3.6 GPM