I'm still stuck, anybody have any ideas?
Are you measuring this while cranking the bike? There will be a voltage drop while cranking.If I keep my positive lead connected to the harnes and back probe the negative output on the ECU that leads to my injector that I'm working on I get 9 volts.
I had my airbox off too, with the sensors disconnected and the bike ran fine.(It ran Ok). As far as I know, the only sensorsMaybe the sensor in the airbox although connected recognizes an issue (its not mounted to the throttle bodies) and the injectors won't work
You said the bike sat for a while.I can hear the pump prime and when my fuel tank is on the bike and I apply 12v directly to the injectors I get a nice even spray.
Is this the first time you are trying to start it? How dirty was the tank and the old fuel pump?It sat for awhile because I live in California
When removing the Battery, make sure everything is turned Off.
*When disconnecting the Battery, disconnect the (-) Battery lead first.
*When connecting the Battery, connect the (+) first and the (-) last.
(This is in the Workshop Manual). Basically, if there is any sparking, you want it to occur on the (-) negative side.
You mentioned that the fuel fuse was also blown. They don't usually blow for no reason. Maybe you
accidentally touched the wrong wires when installing the new pump?
Has the bike started or ran with the new pump??
You said that you can spray starter fluid and the bike runs. That's good, it means the Ecu is working (the ignition side at least). It's also priming the pump and giving codes. All good signs.
I had my airbox off too, with the sensors disconnected and the bike ran fine.(It ran Ok). As far as I know, the only sensors
that will prevent starting are the crank sensor and tip over sensor and maybe the cam sensor. And, you would get codes on the dash if they weren't working.(Fingers crossed).
Another thing to note is that I have the K4 600 which I am familiar with. I have not worked on the K6 750. I also don't have the workshop manual or wiring diagrams for your model. It's hard to find them these days (For free). I understand that your bike has primary and secondary injectors?(K4 only has primary). I am assuming that you were conducting testing on the primary injectors and found 12v there?
You said the bike sat for a while.
Is this the first time you are trying to start it? How dirty was the tank and the old fuel pump?
NB: I'm new at this too, so if I say anything incorrect, feel free to point it out.👍