Buick Riviera won't start, stalls after running, possible starter or fuel pump issue on Buick Riviera

Some Buick Riviera owners report experiencing no-start issues that may be related to the fuel pump and oil pressure switch, indicating potential problems with fuel delivery. Additionally, some owners find that their vehicle stalls after running, often due to a failed fuel pump that requires repair or replacement. Other common reasons for a no-start situation include a dead battery, alternator problems, or a failed starter. In some cases, a faulty Idle Air Control valve may prevent the engine from starting, as it regulates airflow during startup and idle. Furthermore, the fuel pump is controlled by the Powertrain Control Module (PCM) and the Vehicle Anti-Theft (VAT) system, making it crucial to understand their interaction for effective diagnosis. Some owners consider alternative solutions like installing an electric fuel pump or opting for an electric pump/throttle body EFI conversion to address mechanical pump-related starting problems. It is advisable for owners to inspect these components and consult a mechanic or automotive expert for further assistance if they encounter these issues.