1. What is a Horsepower vs Fuel Pump Calculator?

Definition: This calculator estimates the horsepower that can be supported by a fuel pump based on its flow rate and fuel density.

Purpose: It helps automotive professionals and enthusiasts determine if their fuel pump can adequately support their engine's horsepower requirements.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Estimated horsepower supported
• \( Q_f \) — Fuel flow rate (gallons per minute)
• \( \rho_f \) — Fuel density (pounds per gallon)
• \( 0.055 \) — Conversion factor (based on BSFC of 0.5 lb/HP-hr)

Explanation: The fuel flow rate is multiplied by fuel density and a conversion factor to estimate the horsepower that can be supported.

3. Importance of Fuel Pump Calculation

Details: Proper fuel pump sizing ensures adequate fuel delivery to support engine performance and prevent lean conditions that could damage the engine.

4. Using the Calculator

Tips: Enter the fuel pump flow rate in GPM and fuel density (default 6.1 lb/gal for gasoline). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the rule of thumb for fuel pump sizing?
A: A common rule is that 1 GPM supports about 18 HP for gasoline engines (at 6.1 lb/gal density).

Q2: What's a typical fuel density for gasoline?
A: Most gasoline weighs about 6.1 lb/gal, but this can vary slightly based on formulation and temperature.

Q3: How do I find my fuel pump's flow rate?
A: Check manufacturer specifications or measure flow rate at your operating fuel pressure.

Q4: Should I add a safety margin?
A: Yes, it's recommended to have a fuel pump rated for 20-30% more than your calculated needs.

Q5: Does this work for diesel engines?
A: The calculation works but diesel has different density (~7.1 lb/gal) and BSFC values.