A BMW’s high pressure fuel pump is responsible for delivering fuel to the engine at the correct pressure and flow rate. The pump is located in the fuel tank and is driven by the engine’s timing belt.
Fuel is drawn from the tank and pushed through a series of check valves and into the pump. The pump then pressurizes the fuel and sends it to the injectors.
BMW’s high pressure fuel pumps are designed to withstand the extreme pressures and temperatures found in a BMW engine, allowing the engine to run at peak performance. Over time, however, these pumps can wear out, resulting in reduced engine performance. When this happens, it is necessary to replace the pump with a new one.
Look Out for These Signs of a Problem
The pump requires a high pressure fuel pump because the injection system in these vehicles operate at very high pressures. In order to function properly, the pump must be able to maintain a stable output despite fluctuations in demand. The BMW high pressure fuel pump is designed to meet these challenges, delivering consistent performance regardless of conditions. As a result, drivers can enjoy peak performance from their BMW engines, even in the most demanding situations, so when it fails, you’ll begin to notice problems right away.
One symptom is BMW vehicles may display a “Check Engine” light due to a high fuel pressure reading.
Another potential sign of BMW high pressure fuel pump failure is the engine may start and then stall shortly after starting. This can be caused by low fuel pressure as a result of a failing high pressure fuel pump.
BMWs with failing high pressure fuel pumps may also experience hard starts, or the engine may not start at all.
BMWs with failing high pressure fuel pumps may produce knocking sounds from the engine compartment.
If you notice any of these symptoms, it’s important to have your BMW’s high pressure fuel pump checked by a professional as soon as possible to avoid further damage to your vehicle, leading to an expensive repair bill.
Common Causes of a High Pressure Fuel Pump Failure
There are several reasons why BMW’s high pressure fuel pump may fail, including wear and tear from normal use, contamination from debris or water, or a manufacturing defect. BMW owners should be aware of the main reasons for high pressure fuel pump failure in order to keep their vehicle running smoothly. Let’s look at these closer:
Wear and tear is the most common reason for high pressure fuel pump failure in BMWs. The high pressure fuel pump is responsible for pressurizing the fuel system, and over time, the internal components of the pump can wear out. BMW recommends replacing the high pressure fuel pump every 50,000 miles to prevent Pump wear can also be caused by using lower-quality fuels that don’t lubricate the pump as well as premium fuels.
Another common cause of high pressure fuel pump failure is contamination from water or debris. If water gets into the fuel system, it can cause rust and corrosion, which can damage the high pressure fuel pump. Debris can also clog up the pump and prevent it from working properly. BMW recommends regularly changing the fuel filter to prevent contamination from damaging the high pressure fuel pump.
Finally, some BMWs may have a manufacturer’s defect that causes the high pressure fuel pump to fail prematurely. BMW has issued recalls for certain models due to defective high pressure fuel pumps, so BMW owners should check to see if their vehicle is affected by a recall.
High pressure fuel pumps are an essential component of a BMW’s engine, and when they fail, it can be costly to repair or replace them. By understanding the main reasons for high pressure fuel pump failure, BMW owners can take steps to prevent it from happening.
Auto Assets has been your area’s leader BMW independent service center for years. We utilize the most advanced equipment and tools in the industry, and we pride ourselves on our knowledge and ongoing education to keep up with the latest tools, technology, and techniques to keep your BMW running like new. Visit us from nearby Columbus, Dublin, New Albany, Worthington, or Powell, OH. We look forward to earning you patronage.
* BMW X4 Car image credit goes to: Luca Piccini Basile.