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Shutting off the fuel pump should result in only a second or two of lean running before the engine stalls. The system should re-pressurize in a second or so when the relay is grounded again. The biggest problem that I would be concerned with is on the restart the 02s would likely command rich so the savings may not be worth it. I could also open the grounds in the injector circuit to maintain fuel pressure but I would be concerned about spiking the ECM from the field collapse.
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