Fuel Pump Calculator
Calculate required fuel pump flow rate and pressure for your engine specifications
Calculate Fuel Pump Requirements
Flow Rate Calculation
Maximum power output of your engine
Type of air induction system
Type of fuel used by the engine
Pressure Calculation
Standard fuel system operating pressure
Additional pressure from turbo/supercharger
Return systems cycle unused fuel back to tank, returnless regulate at pump
Fuel Pump Requirements
Required Flow Rate
Required Fuel Pump Pressure
Flow Rate Formula: Power × Induction Multiplier × Fuel Multiplier
Induction Multiplier: NA: 0.3735, Turbo: 0.415, Supercharged: 0.498
Pressure Formula: Base Pressure + Boost Pressure
Fuel Pump Sizing Recommendations
Example Calculation
400HP Supercharged Engine
Engine: 400 HP Supercharged V8
Fuel: Petrol (Gasoline)
Induction Multiplier: 0.498 (Supercharged)
Fuel Multiplier: 1.0 (Petrol)
Flow Rate Calculation
Flow Rate = 400 HP × 0.498 × 1.0
Flow Rate = 199.2 L/hr (52.6 GPH)
Fuel Pump Types
Electric Fuel Pump
Most common in modern vehicles
Located in fuel tank, reliable operation
Mechanical Fuel Pump
Driven by engine camshaft
Common in older carbureted engines
High-Pressure Pump
For direct injection systems
Operates at much higher pressures
Fuel Pump Tips
Size pump for 110-120% of calculated flow rate
Ensure fuel lines can handle the flow rate
Use ethanol-compatible pumps for E85 fuel
Consider surge tank for high-performance applications
Install proper filtration to protect injectors
Understanding Fuel Pump Sizing
How Does a Fuel Pump Work?
A fuel pump is like a dedicated delivery system for your car's engine. It sends fuel from the tank to the engine at the correct pressure and flow rate. Modern cars use electric fuel pumps located in the fuel tank for better efficiency and reliability.
Why Proper Sizing Matters
- •Insufficient flow causes fuel starvation and power loss
- •Incorrect pressure affects fuel injection timing
- •Oversized pumps waste energy and generate heat
- •Proper sizing ensures optimal engine performance
Factors Affecting Fuel Requirements
Engine Power
Higher horsepower engines require more fuel. The relationship is roughly linear.
Induction Type
Turbocharged and supercharged engines need more fuel due to forced air induction.
Fuel Type
Ethanol and methanol have lower energy content, requiring higher flow rates.