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Usually (and I say this since I don't have access to a schematic for your sled), power is supplied to the injectors (sometimes through a limiting resistor) and the ECU switches the ground side of the injector. Long story short, it's often easier to switch the ground side than the power side, which is why almost every ECU does it that way.

If you did not have power at the injector when you were pulling, that's an issue. I know you have the problem resolved now, but if it comes back again, try working through the wiring and components that get power to your injectors.
 

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Most likely the Capacitor in the ECU had failed!
Without a code that is most likely the issue.
The Batteryless EFI charges the capacitor first pull to power the pump second pull it starts!
 

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Most likely the Capacitor in the ECU had failed!
Without a code that is most likely the issue.
The Batteryless EFI charges the capacitor first pull to power the pump second pull it starts!
For my own curiosity, can you crack those ECUs open? I haven't worked with those particular ECUs - only the 90's Polaris ones, which have batteries. Would be a fun project to replace that capacitor.
 
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