Once I tried leeching some fuel off my Civic by disconnecting the fuel rail feed pipe, putting it in a jerrican, and turning the ignition on. However what happened was that I got about 1 second and 50 ml of fuel flow each time I turned on the ignition, then it would stop. Probably the ECU turns on the pump on start to pressurise the system, but later pumps fuel only when the engine is running.
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