P0313 – Misfire Detected With Low Fuel means the engine control unit has identified misfire events occurring while the fuel level is critically low. When the fuel tank is near empty, the pump can draw in air or sediment, causing lean conditions that lead to misfires. This can result in rough running, hesitation, or stalling. This guide explains what P0313 means, the symptoms, causes, diagnosis steps, and the best repair solutions to prevent repeat misfires and protect the fuel system.
What Does P0313 Mean?
P0313 is a generic OBD-II trouble code indicating that the ECU detected one or more misfires that occurred at the same time the fuel level sensor reported a low-fuel condition. This code does not specify a particular cylinder; instead, it points to lean misfires caused by insufficient fuel supply or temporary fuel starvation.
While P0313 is often triggered simply by low fuel, it can also indicate hidden fuel pump, filter, or delivery issues that become noticeable only when the tank is nearly empty.
Quick Reference
- OBD-II Family: P-Code (Powertrain)
- Scope: Generic
- System: Fuel Delivery / Ignition / Air-Fuel Management
- Difficulty Level: Easy–Moderate
- Estimated Repair Cost: €0–€350+
- Last Updated: 6 December 2025
Real-World Example / Field Notes
A compact car arrived with a misfire on acceleration and P0313 stored. The driver admitted the fuel gauge had been on empty for several days. After refueling the tank fully and clearing the code, the misfire did not return. The cause was simple fuel starvation due to low tank level.
Another vehicle displayed P0313 repeatedly even with more than ¼ tank of fuel. Testing revealed a weak fuel pump that lost pressure during quick throttle changes. Replacing the pump restored normal fuel delivery and resolved the intermittent misfires.
Symptoms of P0313 – Misfire Detected With Low Fuel
- Engine hesitation: Especially when accelerating with a nearly empty tank.
- Rough idle: Intermittent shaking when fuel supply is inconsistent.
- Loss of power: Poor throttle response or weak acceleration.
- Hard starting: Particularly on inclines or after sitting overnight.
- Stalling: Engine may shut off during fuel starvation.
- Check engine light: Often paired with lean or misfire codes.
Common Causes of P0313
Most Common Causes
- Fuel level extremely low
- Fuel pump drawing air due to low tank volume
- Sediment temporarily blocking fuel pickup
- Lean condition caused by low fuel pressure
- Low-quality or contaminated fuel
Less Common Causes
- Failing fuel pump struggling to maintain pressure
- Clogged fuel filter restricting flow
- Faulty fuel level sensor giving false low readings
- Vacuum leaks causing lean misfire under load
- Dirty fuel injectors unable to deliver proper fuel volume
Diagnosis: Step-By-Step Guide
Start by addressing the fuel level and then inspect the fuel delivery system for problems that worsen when the tank is low.
Tools You’ll Need
OBD-II scanner with live data, fuel pressure gauge, multimeter, smoke machine, and basic hand tools.
- Refuel the vehicle: Add at least 10–15 liters of fuel. If symptoms disappear, the cause was simple fuel starvation.
- Clear the code and test-drive: If P0313 does not return, no further repair is needed.
- Check fuel pressure: Compare pump output to manufacturer specifications.
- Inspect fuel filter: Replace if clogged or overdue for service.
- Review fuel trims: High positive trims indicate lean operation.
- Check for vacuum leaks: Smoke-test intake components for air leaks.
- Inspect fuel pump electrical supply: Test voltage and ground at pump connector.
- Check fuel level sensor data: Verify sensor accuracy using scan tool readings.
- Run injector balance test: Compare flow of each injector for possible restrictions.
- Inspect fuel tank for contamination: Check for debris, rust, or water in fuel.
Pro Tip: Running a vehicle below 10% fuel frequently overheats the fuel pump, reducing pump lifespan and increasing the risk of P0313.
Possible Fixes & Repair Costs
- Refuel the tank: €0 (most common fix)
- Replace fuel filter: €20–€80
- Replace fuel pump: €150–€350+
- Clean or replace fuel injectors: €100–€250
- Repair vacuum leak: €50–€150
- Drain contaminated fuel: €80–€180
Can I Still Drive With P0313?
You can usually drive temporarily, but only after adding fuel. If the tank is very low, misfires may continue and cause stalling. If P0313 appears despite sufficient fuel, stop driving until the fuel system is diagnosed, as fuel starvation at speed can be dangerous.
Related Codes
- P0399 – Ignition Coil “R” Primary/Secondary Circuit
- P0364 – Reserved
- P0363 – Misfire Detected Fueling Disabled
- P0362 – Ignition Coil “L” Primary/Secondary Circuit
- P0361 – Ignition Coil “K” Primary/Secondary Circuit
- P0360 – Ignition Coil “J” Primary/Secondary Circuit
- P0359 – Ignition Coil “I” Primary/Secondary Circuit
- P0358 – Ignition Coil “H” Primary/Secondary Circuit
- P0357 – Ignition Coil “G” Primary/Secondary Circuit
- P0356 – Ignition Coil “F” Primary/Secondary Circuit
Key Takeaways
- P0313 occurs when misfires happen with low fuel levels.
- Most cases resolve simply by refueling, but repeated faults may indicate pump or filter issues.
- Running low on fuel frequently shortens pump life.
- Lean fuel conditions can quickly lead to misfires and drivability issues.
FAQ
Does P0313 always mean my tank is empty?
No, although low fuel is the most common cause. Faulty fuel pumps or sensors can also trigger the code.
Can a clogged fuel filter cause P0313?
Yes. Restricted fuel flow becomes more noticeable when the tank is near empty.
Will misfires stop after refueling?
In many cases, yes. If misfires continue, the fuel system needs deeper diagnosis.
Is it harmful to drive with low fuel?
Yes. Low fuel overheats the pump, pulls in sediment, and increases misfire risk.
What should I check first?
Always begin by adding fuel, clearing the code, and performing a short test drive.