1. What is the Fuel Pump Requirement Formula?

The fuel pump requirement formula calculates the minimum fuel delivery rate needed to support an engine's horsepower output, based on its specific fuel consumption characteristics.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Engine horsepower
• \( BSFC \) — Brake Specific Fuel Consumption (lb/HP-hr)
• 6 — Conversion factor (lbs of fuel per gallon)

Explanation: The formula converts the engine's fuel consumption from pounds per hour to gallons per hour based on the fuel's weight.

3. Importance of Proper Fuel Pump Sizing

Details: Correct fuel pump sizing ensures adequate fuel delivery under all operating conditions, prevents fuel starvation, and maintains proper fuel pressure.

4. Using the Calculator

Tips: Enter engine horsepower and BSFC value (typical values range from 0.4 for efficient engines to 0.6 for high-performance engines).

5. Frequently Asked Questions (FAQ)

Q1: What is a typical BSFC value?
A: Most gasoline engines range from 0.45-0.55 lb/HP-hr. Diesel engines are typically more efficient (0.35-0.45).

Q2: Should I add a safety margin?
A: Yes, most applications add 20-30% to the calculated value to account for pump wear and system losses.

Q3: Does this work for all fuel types?
A: The formula works for any liquid fuel when using the correct BSFC value and fuel weight (6 lbs/gal is typical for gasoline).

Q4: What about forced induction engines?
A: Use the engine's expected maximum horsepower including boost when calculating pump requirements.

Q5: How does fuel pressure affect this?
A: Pump flow ratings decrease at higher pressures. Select a pump that meets your flow requirement at your system's operating pressure.