Why is there half fuel and half empty in the BMW 5 Series fuel tank?
3 Answers
Due to design issues, there is a siphon tube inside the fuel tank that directs gasoline to the side of the fuel pump. Introduction to the BMW 5 Series: The domestic 5 Series is a premium sedan, with the current generation launched in 2004. The BMW 5 Series is undoubtedly one of the most outstanding series in automotive history, with its peak era beginning with the third-generation E34 (1988-1996). The current 5 Series is the third-generation product of the E34. In April 2017, the all-new BMW 5 Series Long Wheelbase version made its global debut. Model Overview: The exterior dimensions of the BMW 5 Series are 5047x1860x1491 (mm), with a wheelbase of 2888 mm. The new 5 Series is 66 mm longer than the previous generation. The powertrain of the BMW 5 Series has been further enhanced. The top-of-the-line 545i is equipped with a V8 engine from the 7 Series, delivering a maximum power of 245 kW/333 hp (6100 rpm) and a maximum torque of 450 Nm (3600 rpm). It has a top speed of 250 km/h and accelerates from 0-100 km/h in just 5.9 seconds. The BMW 5 Series is positioned between the sporty and stylish 3 Series and the elegant and noble 7 Series. It perfectly blends dynamism and elegance with the functionality of a high-end business sedan, uniting BMW's great tradition, forward-looking spirit, and timeless aesthetic standards. The Brilliance BMW 5 Series is the latest model in its series.
Friends who have driven the BMW 5 Series probably know this: sometimes the fuel gauge shows half a tank, while the other half seems empty. This is actually quite common. I've encountered it several times, and the main reason is usually that the float of the fuel level sensor gets stuck. The BMW fuel tank has a somewhat complex internal design with baffles to prevent sloshing, but when the fuel level is low, the float can get stuck in the middle position, leading to inaccurate readings. Another possibility is that the sensor is aging or there's poor contact in the wiring, causing misreadings. My suggestion is to first try filling up the tank to see if the gauge returns to normal. If the issue persists, there's a high chance you'll need to visit the dealership to replace the sensor. To prevent this problem, avoid overfilling or underfilling the tank when refueling, and make sure to regularly maintain and inspect the wiring during routine servicing. After all, an inaccurate fuel gauge can affect driving decisions, and running out of fuel midway would be a real hassle.
Those who frequently deal with car issues know that abnormal fuel gauge readings in a BMW 5 Series are often caused by a faulty fuel level sensor. Inside the fuel tank, this sensor has a float that should move correctly whether the tank is full or empty. However, over time, deposits may jam it or parts may wear out, causing the reading to get stuck halfway. The tank's anti-slosh design can also make the fuel surface uneven, affecting the float's position. It's best to use a diagnostic tool connected to the OBD port to check for error codes. If the gauge still shows incorrect readings after refueling, inspect the fuses or wiring for possible shorts. Don’t delay—repair or replace the faulty parts promptly to prevent minor issues from escalating into major failures, especially those affecting the fuel pump’s operation. Remember to ask technicians to check the sensor’s condition during regular maintenance to save both money and hassle.
