The fuel pump is tasked with moving gasoline from the tank to the engine at a constant, high pressure. A failing pump can cause sputtering at high speeds, difficulty starting, and a total loss of power. For the BMW M5, using an OEM pump ensures that the system can maintain the massive fuel flow required during aggressive driving.

Worst Drawbacks of Using Aftermarket Fuel Pumps

1. Excessive Operating Noise

Aftermarket pumps are often much louder than factory units, creating a persistent buzz.

2. Unreliable Fuel Level Readings

Generic sending units often provide inaccurate data, causing your fuel gauge to fluctuate or show "empty" when you still have fuel.

3. Shorter Lifespan in Hot Climates

Cheaper internal motors are more prone to burnout when subjected to high temperatures.

4. Inconsistent Fuel Pressure

Aftermarket pumps may pulse or surge, leading to a rough idle or stumbling during hard acceleration.

5. Poor Tank Seal Fitment

The rubber gaskets included with aftermarket pumps are often the wrong thickness, leading to persistent gasoline smells.

6. Incompatibility with Control Modules

Some aftermarket pumps draw too much amperage, which can overheat.

7. Lack of Internal Check Valves

Inexpensive pumps often lack a check valve, causing fuel to drain back into the tank and resulting in long, frustrating crank times.

Get a Reliable Fuel Pump at Shop BMW Auto Parts Warehouse

Don't let a failing pump leave you stranded on the side of the road. To ensure you are ordering the correct part, reach out to us today.