The W211 E350 PZEV Fuel Tank Problem: Why a "Fuel Pump" Repair Turns Into a $3,000 Dealer Bill

A plain-English guide for 2006–2009 Mercedes-Benz E350 (W211) owners with a PZEV low-emissions fuel system — what actually fails, why it's so expensive at the dealer, and how to source the correct tank for a fraction of the price.

The symptom: it starts as a fuel delivery problem

Owners usually notice it as long crank times, hard starting (especially on a full tank), a strong fuel smell, a check-engine light, or a car that stumbles and stalls. The natural assumption is a bad fuel pump — a common, cheap fix on most cars.

Why it's not a simple pump job on a PZEV E350

On W211 models built with the PZEV (Partial Zero Emissions Vehicle) low-emissions system, the fuel pump and level sender are a sealed module built into the fuel tank. Mercedes does not sell the internal pump components separately for these tanks. When the pump assembly fails, the factory repair is to replace the entire fuel tank — which is why a problem that sounds like a $150 pump becomes a four-figure repair.

Metal or plastic? Settling the confusion

This trips up owners, recyclers, and even experienced techs — because everyone is looking at a different part of the same tank. Accessed from the top (through the panel under the rear seat), you see a plastic service coating over the sender, so it looks like a plastic tank. Pulled out of the car by a dismantler, you see the metal tank body. Both are right.

The bottom line: the PZEV tank is a metal-bodied tank with a plastic cover on top. Don't shop by material alone — shop by the part number stamped on the tank.

The part numbers that matter

• Current PZEV fuel tank: A211-470-88-01 (2114708801)
• Supersedes the earlier 2114703701 — many 2006 cars were built with the older number and it is replaced by 2114708801. Verify against your VIN.
• PZEV is Mercedes option code 917. If your car is coded 915, it is not PZEV and uses a different, non-interchangeable tank. Confirm your option code before ordering.

Important: the PZEV and non-PZEV tanks are not interchangeable. Always confirm your option code and the number stamped on your existing tank before buying.

Why the dealer price is so high

A new genuine PZEV tank from Mercedes historically ran north of $2,300 for the part alone, and the tank is now largely discontinued through normal dealer channels. On top of that, the job requires removing the full exhaust system and lowering the driveshaft to drop the tank — roughly a five-hour labor operation. Dealer all-in quotes commonly land around $3,000.

The smarter path

Because the tank body itself rarely fails — it's the internal pump/sender that goes — a correct, verified used or sourced tank gets you back on the road for a fraction of the dealer price. The key word is verified: the right option code (917), the correct stamped part number (2114708801 / 2114703701), and a tank confirmed complete.

We'll source the correct tank for you

This is exactly the kind of hard-to-find Mercedes part BenzUnited Parts specializes in. If you're facing this repair and want to skip the dealer markup, contact us with your VIN and we'll confirm your option code, match the correct tank, and arrange it to be shipped to you or your shop.

Contact BenzUnited Parts to source your PZEV fuel tank →

Fitment and part numbers should always be verified against your vehicle's VIN and option codes before purchase. PZEV (code 917) and non-PZEV (code 915) fuel tanks are not interchangeable.