1. What is the Fuel Pump Flow Rate Equation?

The fuel pump flow rate equation calculates the volumetric flow rate of a fuel pump based on engine RPM and pump displacement. It provides an estimate of the fuel delivery capacity in gallons per hour (GPH).

2. How Does the Calculator Work?

The calculator uses the fuel pump flow equation:

Where:

• \( Q \) — Fuel pump flow rate (GPH)
• \( RPM \) — Engine revolutions per minute
• \( Disp \) — Pump displacement (in³/rev)

Explanation: The equation calculates the theoretical flow rate by multiplying RPM with pump displacement and dividing by 2 to convert to gallons per hour.

3. Importance of Fuel Pump Flow Calculation

Details: Accurate fuel pump flow calculation is crucial for ensuring proper fuel delivery to the engine, preventing fuel starvation, and optimizing engine performance and efficiency.

4. Using the Calculator

Tips: Enter engine RPM and pump displacement in in³/rev. All values must be valid (RPM > 0, displacement > 0).

5. Frequently Asked Questions (FAQ)

Q1: Why divide by 2 in the equation?
A: The division by 2 is a conversion factor that transforms the result from cubic inches per minute to gallons per hour.

Q2: What are typical fuel pump flow rates?
A: Flow rates vary by application, but typical automotive fuel pumps range from 20-100 GPH depending on engine requirements.

Q3: Does this account for pump efficiency?
A: This is a theoretical calculation and does not account for pump efficiency, pressure losses, or other real-world factors that may affect actual flow.

Q4: When should I upgrade my fuel pump?
A: Consider upgrading when modifying your engine for higher performance, or if you experience fuel starvation symptoms at high RPM.

Q5: How do I measure pump displacement?
A: Pump displacement is typically specified by the manufacturer and can be found in the pump's technical specifications.