The low fuel warning won't keep the engine from running. It's just that, a warning to let you know the fuel level in the tank is low. A look thru the service manual should let you figure out what the ECU is looking for on that circuit. A resistor in the circuit most like will eliminate the warning light. But I doubt it will get the engine running. There is probably some other issue that is causing it to not run.
Besides the tip over sensor, there are the side stand switch, the transmission neutral switch and the clutch lever switch that all need to be correctly by passed and can cause it not to start or run. None of those issues will throw a FI code either.
Besides the tip over sensor, there are the side stand switch, the transmission neutral switch and the clutch lever switch that all need to be correctly by passed and can cause it not to start or run. None of those issues will throw a FI code either.