Fuel crossfeed is allowed in which engine configuration?

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Fuel crossfeed is a valve system that lets you move fuel from one tank to another or directly to an engine to ensure a continuous feed. When there’s only one engine, crossfeed can be used to select fuel from either tank to feed that single engine, making it possible to manage fuel sources and balance from the available tanks. With two engines, crossfeeding becomes riskier for fuel management because transferring fuel between tanks can affect the feed to both engines and complicate balance and reliability, so it’s not used routinely for all engines. Therefore, the configuration that allows crossfeed in normal operations is a single-engine setup.