2016 Mercedes GLE 350 Fuel Pump Location: Where It Sits and How to Access It

On a 2016 Mercedes-Benz GLE 350, the fuel pump is located inside the fuel tank, mounted under the rear seat area on the driver's side of the vehicle. You cannot see it from under the car. To reach it, you remove the rear seat bottom cushion and open the access cover on the tank, or you lower the fuel tank from underneath the vehicle. This is the same layout used on most modern Mercedes-Benz SUVs, where the pump, fuel level sender, and filter are built into one module inside the tank.

Gasoline in the tank cools and lubricates the pump, so Mercedes places it inside the tank rather than along the frame rail. Below is everything you need to know about finding it, checking it, and replacing it on your GLE 350.

1. Why the Fuel Pump Lives Inside the Tank

The 2016 GLE 350 (chassis code W166, with the 3.5L V6 gasoline engine in the GLE 350 model) uses an in-tank electric fuel pump. The pump module sits at the bottom of the tank and pushes fuel forward to the engine bay at high pressure.

Inside the tank, the pump is surrounded by fuel. That fuel does two jobs. It keeps the electric motor from overheating, and it provides lubrication for the moving parts. If you run the tank down to empty often, the pump loses that cooling bath and wears out faster.

The module includes the pump itself, a fuel filter, a fuel pressure regulator, and the fuel level sending unit that tells your dash gauge how much gas you have left. Because all of these parts are one assembly, Mercedes and most repair shops replace the whole module rather than taking it apart.

2. Exact Location on the 2016 GLE 350

Open the rear doors and look at the floor under the second-row seat. The fuel pump access point is under the rear seat cushion, on the driver's side (left side on US models).

The metal floor pan has a round access cover held in place by screws or a twist-lock ring. Under that cover is the top of the fuel pump module, with the fuel lines, the electrical connector, and the lock ring that holds the pump in the tank.

If your GLE 350 is a model without a convenient access panel, the job is done from underneath. In that case the tank is supported by straps and must be lowered enough to pull the pump out the top of the tank. On the W166 GLE, the in-cabin access under the rear seat is the usual path used by technicians.

3. Signs Your Fuel Pump Is Failing

A worn pump usually gives warning before it stops working completely. Watch for these symptoms:

1. Engine cranks but will not start. This is the most common complaint. You turn the key or push the start button, the starter spins the engine, but it never fires because no fuel is reaching the injectors.

2. Long crank times. The engine turns over for several seconds before it catches. This often gets worse over weeks.

3. Loss of power under load. The engine runs fine at idle but stumbles, hesitates, or loses power when you accelerate, climb a hill, or merge onto a highway.

4. Surging or jerking at speed. The vehicle speeds up and slows down on its own because fuel delivery is not steady.

5. Whining noise from the rear. A loud hum or whine coming from under the rear seat area is the pump motor struggling.

6. Engine stalls and will not restart. The pump quits when it gets hot and may restart after it cools down.

A fuel pressure test at the rail is the reliable way to confirm a bad pump. A shop connects a gauge and checks that pressure meets the factory specification for the GLE 350.

4. How to Access the Fuel Pump: Basic Steps

This is a summary of the job, not a full repair manual. Fuel systems hold pressure and gasoline vapor is dangerous. Work in a ventilated area, keep sparks and open flame away, and disconnect the battery before you start.

1. Relieve fuel system pressure. Remove the fuel pump fuse or relay and run the engine until it stalls. Then crank it once more. Turn the key off and disconnect the negative battery cable.

2. Lift out the rear seat cushion. The bottom cushion pulls up at the front edge. Release the clips and lift the cushion out of the car.

3. Remove the access cover. Unscrew the cover over the pump location. You will see the top of the pump module and the lock ring.

4. Disconnect lines and wiring. Label the fuel lines before you remove them. Unplug the electrical connector. Some fuel will spill, so have rags ready.

5. Turn the lock ring. Use a lock ring tool or a brass drift and hammer. Turn it counterclockwise until it releases.

6. Lift the pump module out. Pull the assembly straight up and out. You may need to tilt it to clear the float arm on the sender.

7. Replace the seal. Never reuse the old tank seal. A new O-ring or gasket prevents fuel vapor leaks and check-engine lights.

8. Install the new pump. Seat the new module, tighten the lock ring, reconnect lines and wiring, reinstall the cover and seat, reconnect the battery, and cycle the key a few times to prime the system before starting.

5. Choosing a Replacement Pump

The 2016 GLE 350 needs a pump that matches the factory flow rate and pressure. A pump that is too weak will cause lean running and poor performance. A pump that is too strong can overwhelm the regulator.

1. Match the part to your VIN. The GLE 350 uses a specific pump module. Check your VIN before ordering, because running changes happen during a model year.

2. Replace the filter and seal at the same time. The cost is small compared with doing the job twice.

3. Look for a direct-fit assembly. A complete module drops in without modification, saves labor time, and keeps the fuel gauge accurate.

6. Recommended Replacement: KEMSO Fuel Pumps

For a replacement on the 2016 Mercedes GLE 350, we recommend KEMSO brand fuel pumps. KEMSO fuel pumps are high-performance units built as direct OEM replacements, so they match the factory flow rate, pressure, and fitment for your GLE 350 without modification. Every KEMSO fuel pump comes with a lifetime warranty, which means you are covered for as long as you own the vehicle.

KEMSO builds the complete pump module with the pump, sender, and seal, so the install is a true bolt-in job. High-quality materials handle today's fuel blends, including ethanol mixes, and the pump is tested before it ships. For a GLE 350 that sees daily driving, highway trips, or towing, a KEMSO pump gives you reliable fuel delivery and the peace of mind of a lifetime warranty.

You can see the full line and order the correct pump for your vehicle here: https://www.kemsoracing.com/

7. Cost and Time Expectations

A fuel pump replacement on a 2016 GLE 350 is a labor-intensive job. Independent shops usually quote several hours of labor because the tank or seat area has to be opened. Dealer rates are higher than independent shop rates.

1. Parts cost varies by brand. A basic replacement costs less; a lifetime-warranty performance unit costs more up front but may save money over the life of the car.

2. Labor is the bigger share of the bill. Most of the invoice is the hours needed to access and reseal the tank.

3. Doing it yourself saves labor. If you have the tools, a safe workspace, and mechanical experience, the job is within reach for a home mechanic.

8. How to Make the New Pump Last

1. Keep the tank above a quarter full. Fuel cools the pump. Running low all the time shortens pump life.

2. Replace the fuel filter on schedule. A clogged filter makes the pump work harder.

3. Use quality gasoline. Top-tier fuel keeps deposits from building up on the pump and filter.

4. Fix a check-engine light quickly. Lean or rich codes can point to delivery problems before the pump fails completely.

Final Word

The 2016 Mercedes GLE 350 fuel pump is inside the gas tank, reached from under the rear seat on the driver's side. Knowing this location saves diagnosis time and helps you talk to your mechanic with confidence. When it is time to replace the pump, match the part to your VIN, install a new seal, and choose a pump built for long service life.

For a high-performance, direct OEM replacement with a lifetime warranty, visit https://www.kemsoracing.com/