Fuel Pump Calculator
Estimate the fuel pump flow rate and pressure you need for an engine setup.
The calculator uses engine power, induction type, and fuel type to produce a practical sizing estimate.
Result
--
Run the calculation to see the fuel pump estimate.
| Metric | Value |
|---|---|
| Base flow rate | -- |
| Fuel-adjusted flow rate | -- |
| Recommended pump pressure | -- |
| Safety margin flow | -- |
Quick Answer
Multiply engine power by the induction multiplier, then adjust for fuel type to estimate required pump flow. Add base pressure and boost pressure to estimate the pressure target.
How to Calculate
- Enter engine power and choose the unit.
- Choose the induction type and fuel type.
- Enter the base fuel pressure and boost pressure.
- Click Calculate.
Formula
Base flow rate = power x induction multiplier
Adjusted flow rate = base flow rate x fuel factor
Recommended pressure = base pressure + boost pressure
Worked Examples
Example 1: 300 hp naturally aspirated on petrol gives a lower flow rate than a boosted engine.
Example 2: Turbocharged engines typically need more fuel flow than naturally aspirated engines.
Example 3: E85 and methanol usually require more flow than petrol.
How to Interpret Your Results
| Output | Meaning | Action |
|---|---|---|
| Adjusted flow rate | Approximate fuel flow your pump should supply. | Compare it with pump manufacturer specs. |
| Recommended pressure | Approximate rail or pump pressure target. | Verify your regulator and fuel system can hold it. |
| Safety margin | A 10 percent higher flow target. | Use it if you want extra headroom. |
Frequently Asked Questions
Related Calculators
References
- OmniCalculator reference page
- Fuel flow depends on engine power, induction type, and fuel type.
- Last reviewed: March 2026.