Fuel Pump Flow Rate Calculator
Convert fuel pump flow rates between GPH, GPM, L/h, and L/min with this free pump flow rate converter. Compare flow units with interactive charts for precise pump sizing and selection.
About This Calculator
Our Fuel Pump Flow Rate Calculator helps automotive enthusiasts, mechanics, and engineers convert fuel pump flow rates between four common units of measurement. Whether you are sizing a pump for a performance engine build, troubleshooting fuel delivery issues, or comparing specifications from different manufacturers, this tool provides instant and accurate conversions between GPH (gallons per hour), GPM (gallons per minute), L/h (liters per hour), and L/min (liters per minute).
The calculator uses the standard conversion factors: 1 US liquid gallon equals exactly 3.78541 liters, and 1 hour equals 60 minutes. All conversions are computed precisely using these fixed relationships. For example, to convert from gallons per hour (GPH) to gallons per minute (GPM), the value is divided by 60. To convert from GPH to liters per hour (L/h), the value is multiplied by 3.78541. The tool handles conversions in any direction — simply select your input unit and the calculator displays the equivalent flow rate in all other units simultaneously.
Regional Notes
United States: Fuel pump flow rates are typically specified in GPH (gallons per hour) for automotive applications. Common performance fuel pumps range from 50 GPH for stock replacements to 340 GPH for high-horsepower race applications. Walbro, AEM, and Bosch are popular brands that rate their pumps in GPH or L/h.
United Kingdom: Fuel pump specifications in the UK and Europe are usually expressed in liters per hour (L/h) or liters per minute (L/min). Metric measurements are standard in European automotive and industrial applications. Note that UK uses imperial gallons for fuel economy but fuel pump flow rates are typically quoted in metric units.
India: Similar to Europe, metric units (L/h, L/min) are most common for fuel pump specifications in Indian automotive and industrial applications. Our calculator supports both customary and metric units so you can work with any specification sheet regardless of origin.
Frequently Asked Questions
How does the Fuel Pump Flow Rate Calculator work?
The calculator converts fuel pump flow rates between four common units: GPH (gallons per hour), GPM (gallons per minute), L/h (liters per hour), and L/min (liters per minute). It uses the standard conversion factors: 1 US gallon = 3.78541 liters and 1 hour = 60 minutes. Simply enter your flow rate and select the input unit to see the equivalent values in all units instantly.
How do you convert GPH to GPM?
To convert gallons per hour (GPH) to gallons per minute (GPM), divide the GPH value by 60. For example, a 60 GPH fuel pump equals 1 GPM. Conversely, to convert GPM to GPH, multiply by 60. This conversion is handled automatically by our calculator.
What fuel pump flow rate do I need for my engine?
The required fuel pump flow rate depends on your engine's horsepower and fuel type. A general rule is that naturally aspirated engines need about 0.5 lbs of fuel per horsepower per hour, while forced induction engines need 0.6-0.7 lbs/hr. At 60 GPH (227 L/h), a typical performance fuel pump can support approximately 400-500 hp for naturally aspirated engines and 300-400 hp for turbocharged engines. Always consult your engine builder or tuner for exact requirements.
What is the difference between US gallons and imperial gallons?
The US liquid gallon (3.78541 liters) is different from the UK imperial gallon (4.54609 liters). The imperial gallon is about 20% larger. Our calculator uses US gallons, which is the standard for fuel pump specifications in the United States. In the UK and Europe, fuel pump flow rates are typically specified in liters per hour (L/h) or liters per minute (L/min), which our calculator also supports.
Why are fuel pump flow rates measured in different units across regions?
Fuel pump flow rate units vary by region due to different measurement systems. In the United States, gallons per hour (GPH) is the standard for automotive fuel pumps. In the UK and Europe, liters per hour (L/h) or liters per minute (L/min) are commonly used. Our calculator supports all four major units so you can easily convert between US customary and metric measurements regardless of where you are located or what specifications your pump uses.
Does this calculator work for diesel fuel pumps too?
Yes, this calculator works for any type of fuel pump including petrol, diesel, ethanol, and other liquid fuel pumps. The flow rate conversion is based purely on volume and time units, not on fuel type. A 100 L/h diesel pump will also flow 100 L/h of petrol at the same pressure, though actual mass flow will differ due to different fuel densities.
Is this fuel pump calculator free to use?
Yes, all calculators on Calculy are completely free to use with no registration, downloads, or hidden fees. You can also share your calculation results with others via the shareable URL link that preserves your input values.
Can I use this for industrial or hydraulic pump applications?
Absolutely. While this calculator is designed with automotive fuel pumps in mind, the flow rate conversions work for any liquid pump application including industrial pumps, hydraulic systems, water pumps, and chemical transfer pumps. Simply enter your flow rate in any supported unit to see the equivalent in all other units.