How to Deal with the Overflow Fault of B50 Secondary Air Pump?

1 Answers
Vieira
07/30/25 3:17am
Replace the secondary air valve. Here are the detailed related contents: Solution: Depending on the vehicle model, the secondary fuel supply operation varies. However, for European vehicles, the fuel pump typically operates once when the driver's door is opened and the ignition key is turned to the ON position, and then continues to work after ignition. Working Principle: The engine drives the air pump crankshaft via two V-belts, which in turn drives the piston to pump air. The compressed air is then directed into the air reservoir through a guide pipe. On the other hand, the air reservoir supplies gas to the pressure regulator fixed on the air pump through a pipe, thereby controlling the air pressure in the reservoir. When the air pressure in the reservoir drops below the set value due to leakage, the valve in the pressure regulator returns to its original position via the return spring, disconnecting the air pump's control circuit, and the air pump resumes pumping.
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