Well, I just checked the EX250K service manual and even though the fuel pump occupies the same mounting position as the fuel sender in my carb’d bike it doesn’t look like there is a proper fuel sender built into the pump. I mean, it only has two leads, which is the bare minimum to power the pump. Perhaps the ECU can tell when it starts to pump air based on the fuel pressure or resistance through the pump’s power leads or something. I poured over all the stuff about fuel pressure and it never mentions the fuel light being associated with it but maybe there is a clog or restriction in there somewhere.
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