What is the fuel pressure for a BMW 525?

2 Answers
StDelaney
07/29/25 8:31am
BMW 525 car fuel pressure normal value is between 300kpa to 350kpa. Fuel pressure testing method: Turn on the ignition switch (without starting the engine) to activate the electric fuel pump. The fuel pressure at this time should meet technical requirements, generally fluctuating around 0.3MPa. When the engine is idling, the reading on the fuel pressure gauge is the idle working pressure of the fuel supply system, generally 0.25MPa or as specified by the vehicle's technical standards. When checking the idle working pressure, removing the vacuum tube from the fuel pressure regulator should cause the pressure to rise to 0.3MPa; otherwise, the pressure regulator should be replaced. Symptoms of insufficient fuel pressure: Insufficient fuel supply from the fuel pump. The fuel supply from the pump depends on the diaphragm stroke: a larger stroke should result in more fuel being pumped. However, if the pump's fuel output is low while the engine's fuel consumption is high, this indicates insufficient fuel supply from the pump. This can lead to a drop in the fuel level in the carburetor float chamber and insufficient engine power.
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DelWillow
08/11/25 6:03pm
The fuel pressure for a BMW 525 typically ranges between 3 to 4 bar (approximately 43-58 psi), but the exact value depends on the model year and engine type. For example, earlier models like the 525i with a 2.5L engine may have a pressure around 3.2-3.5 bar. As a regular customer at repair shops, I've encountered several issues: low pressure can cause hard starting and engine shaking, while excessively high pressure may increase fuel consumption or damage the injectors. To check it yourself, use a simple fuel pressure gauge connected to the fuel rail and observe fluctuations at idle and during acceleration. However, I advise against DIY attempts—high-pressure systems are risky. It's best to consult the manual or have a professional technician scan for error codes with diagnostic tools. Regular maintenance of the fuel filter and fuel pump can prevent instability-related issues. Long-term pressure variations are normal, but ignoring them could lead to major repairs costing thousands.
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