1. What is Fuel Pump LPH vs Horsepower Calculator?

Definition: This calculator estimates the required fuel pump flow rate in liters per hour (LPH) based on engine horsepower and fuel density.

Purpose: It helps automotive professionals and enthusiasts determine the appropriate fuel pump capacity for their engine setup.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q_{lph} \) — Fuel pump flow rate (liters per hour)
• \( HP \) — Engine horsepower
• \( \rho_f \) — Fuel density (pounds per gallon)

Explanation: The formula converts horsepower requirements to fuel volume needs, accounting for fuel density and unit conversions.

3. Importance of Fuel Pump Sizing

Details: Proper fuel pump sizing ensures adequate fuel delivery at all engine speeds and loads, preventing lean conditions that can damage engines.

4. Using the Calculator

Tips: Enter the engine horsepower and fuel density (default 6.0 lb/gal for gasoline). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical fuel density value?
A: Gasoline is typically 6.0-6.3 lb/gal, while diesel is about 7.0-7.3 lb/gal.

Q2: Should I add a safety margin to the calculated flow rate?
A: Yes, it's recommended to select a pump with 20-30% more capacity than calculated to account for peak demands.

Q3: Does this account for forced induction?
A: No, for turbocharged/supercharged engines, use the expected horsepower at boost pressure.

Q4: How does fuel pressure affect this calculation?
A: This calculates flow requirement at the pump. Actual flow at the injectors depends on pressure and system restrictions.

Q5: What if I'm running ethanol blends?
A: E85 has lower energy content, so you may need to multiply the result by 1.3-1.4 for adequate flow.