⚠️ Mercedes-Benz manufacturer position
Mercedes WIS describes module access under rear seat bench. Wrong fuel is misuse.
Vehicle information
| Make | Mercedes-Benz |
|---|---|
| Model | E-Class |
| Market status | Sold new in Great Britain — W214 (2023–present) and W213 used stock |
| Body styles | Saloon, Estate, All-Terrain |
| Generations | W212, W213, W214 (current UK saloon) |
| Engine options | Petrol: 2.0–3.0 L petrol including mild hybrid EQ Boost on UK line Diesel: 2.0 OM654 diesel on UK E-Class diesel Hybrid: Plug-in hybrid petrol (E 300 e / E 300 de where offered) |
| Fuel tank capacity | Approximately 66 litres |
| Fuel system | Petrol direct injection; diesel common-rail; PHEV petrol filler unchanged |
| Access method | Under rear seat fuel pump access on most UK E-Class |
| Anti-siphon | Yes |
| Service portal | Mercedes-Benz WIS / XENTRY Workshop (authorised dealers) |
Misfuel risk Moderate
Petrol and diesel variants share similar filler arrangements; mis-fuelling most often affects diesel models where petrol causes immediate high-pressure system risk.
If the engine was not started
OEM fuel extraction, filter, flush as needed.
If the engine was started
Petrol in OM654 diesel: expect major HP system work if driven.
Access procedure
- Disconnect the negative battery terminal and relieve fuel system pressure per OEM procedure.
- Access the in-tank fuel pump module via the manufacturer-specified route (access panel or tank lowering).
- Drain contaminated fuel using approved recovery equipment into suitable containers for hazardous waste duty of care.
- Inspect the tank, sender unit, and lines; replace the fuel filter and any contaminated flexible lines as required.
- Reassemble, refill with the correct fuel grade, prime the low-pressure circuit, and check for leaks before start.
- If the engine was run on wrong fuel, follow OEM guidance for high-pressure pump, rail, and injector inspection before restart.
Related models
- C-Class
- S-Class
Frequently asked questions
What should I do if I put petrol in my Mercedes-Benz E-Class diesel?
Do not start the engine. Arrange OEM-method tank fuel extraction and hazardous waste disposal under UK duty of care. A GBIFDA-certified technician can document the procedure for insurers.
Does Mercedes-Benz warranty cover misfuel on a E-Class?
Manufacturer warranties typically exclude wrong fuel as misuse. Expect out-of-pocket or insurance-funded repair.
Can I siphon fuel from a Mercedes-Benz E-Class?
UK Mercedes-Benz models usually have anti-siphon filler necks; OEM information specifies pump-module or tank removal instead.
When are injectors replaced after misfuel on a E-Class?
If the engine ran on contaminated diesel, injectors and HP pump are inspected or replaced per Mercedes-Benz diagnostics; not always required if caught before start.
Need professional misfuel recovery?
Find a certified operator or read consumer guidance for your next steps.
Find an operator Consumer guidance