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This code is usually a free fix. P0313 means the engine ran misfire-prone with very little fuel in the tank. The fuel pump can't prime properly when the tank is below ~1/8. Fill up to at least half a tank, drive 20–30 miles, and the code clears itself. See top-rated scanners on Amazon ↑
🗺️ Where Is the Problem?
Blueprint view - P0313 misfire condition triggered by low fuel level
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0313 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
60%
#1 - Most Likely
Low Fuel Level (Driving on Fumes)
The most common P0313 cause is exactly what the code says: you drove the tank too low. Fuel sloshing away from the pickup starves the engine, causing misfires. Fill up, clear the code, and drive 20+ miles - problem solved.
🔩 Part
$0
👨🔧 Labor
$0
⚡ DIY Difficulty
Easy
25%
#2 - Check First
Failing Fuel Pump
A weak fuel pump that can still keep up with a full tank may starve at low levels because it can't lift fuel as high. P0313 returning quickly even with a full tank usually means the pump is on its way out. Test fuel pressure to confirm.
🔩 Part
$120–$400
👨🔧 Labor
$200–$500
⚡ DIY Difficulty
Hard
15%
#3 - Less Common
Faulty Fuel Level Sensor
If the gas gauge reads inaccurately, the ECM may think you're low on fuel when you aren't. Combined with any minor misfire elsewhere, this triggers P0313. Confirm with a scan-tool reading of fuel-level sensor voltage vs. actual tank fill.
🔩 Part
$40–$120
👨🔧 Labor
$200–$400
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Fill the tank to at least half full - this alone fixes the issue 60% of the time. Avoid running below 1/4 tank routinely.
- Drive 20–30 miles in mixed conditions - this completes the misfire monitor and usually clears the code automatically.
- Manually clear the code with a scanner if it doesn't self-clear after the drive cycle. Bluetooth OBD2 scanners work great for this.
- If P0313 returns with a full tank - test fuel pressure at the rail. Spec is typically 50–65 PSI. Low pressure = failing pump.
- Check fuel-level sensor accuracy - with scan tool, watch fuel level PID while you fill. Should track linearly. Stuck or noisy readings indicate sender failure.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need