Volvo V70 engine slowdown possibly related to gas flow on Volvo V70

Some Volvo V70 owners report experiencing engine slowdown issues potentially related to gas flow, such as decreased acceleration, rough idling, or stalling due to low-quality fuel or water in the fuel system. Additionally, they may encounter problems stemming from a failing signal to the fuel pressure relay, a contaminated fuel injection system, or a malfunctioning MAF sensor, which can cause the engine to start and then die. Erratic idling, surging revs, or stalling when slowing down may indicate that the fuel pump/filter combination is not supplying sufficient fuel flow, leading to stallouts until adequate pressure is restored. Some owners also note that using higher octane fuel than necessary can reduce fuel efficiency, while certain engine noises mistaken for pre-ignition knocks can further impact performance. Furthermore, issues like a malfunctioning purge valve or disconnected fuel line can result in fuel vapors in the engine compartment, negatively affecting engine operation. It is crucial for owners to address these fuel system concerns to troubleshoot and resolve any engine performance issues.