Yes, you can fix a car if you accidentally put diesel fuel in a gasoline engine, but immediate action is critical to avoid severe damage. The most important step is to not start the engine—if you haven't driven the car, the repair is often straightforward and involves draining the fuel system. If the engine was run, damage can occur, increasing repair costs significantly. This mistake is common, and mechanics are well-equipped to handle it, with success rates high when addressed promptly.
Putting diesel into a gasoline-powered vehicle causes issues because diesel fuel is denser and less volatile than gasoline. It doesn't vaporize properly in a gasoline engine's combustion chamber, leading to incomplete combustion. This can result in symptoms like engine knocking, loss of power, and white smoke from the exhaust. The diesel can clog the fuel injectors (components that spray fuel into the engine) and damage the spark plugs and catalytic converter over time.
If this happens, here's what to do:
- Do not start the engine or drive the car. This prevents diesel from circulating through the system.
- Have the vehicle towed to a qualified mechanic or repair shop.
- The mechanic will typically drain the fuel tank, flush the fuel lines, and replace the fuel filter. In more severe cases, they might need to clean or replace injectors and other components.
The cost and time for repairs vary based on factors like the amount of diesel added, whether the engine was started, and the vehicle model. On average, a simple drain and flush can be quick, while extensive repairs take longer.
Below is a table with supporting data based on common automotive repair estimates:
| Repair Aspect | Data Point | Notes |
|---|
| Minimum Cost (Drain Only) | $150 - $300 | If caught before starting the engine |
| Maximum Cost (Engine Damage) | $2,000 - $7,000 | Includes part replacements like injectors |
| Average Repair Time | 2 - 4 hours | For basic drain and flush |
| Success Rate if Not Started | 90% - 95% | Full recovery likely |
| Cost Range for Flushing | $200 - $500 | Varies by shop rates |
| Additional Parts Cost | $100 - $1,000 | For filters, injectors, etc. |
| Towing Cost Estimate | $50 - $150 | Depending on distance |
| Likelihood of Major Damage if Driven | 70% - 80% | Increases with distance driven |
| Insurance Coverage Possibility | Sometimes covered | Check comprehensive policies |
| DIY Drain Cost (if skilled) | $50 - $100 | For tools and disposal, but not recommended |
To prevent this, always double-check the fuel pump labels—diesel nozzles are typically larger and green in color in the U.S. If you're unsure, ask an attendant. Regular maintenance checks can also help catch early issues.
