I pulled the ecu and did not blow, but does that meaan the ecu is bad
Well I did help you with what I thought was going to be the 'either/or'.
A 15 Amp fuse is a relatively big fuse, so blowing it means a serious fault, and even more serious if you unplugged the fuel pump and it still blows.
I am a bit puzzled by the problem linking to the fuel pump relay. The ECU does control the fuel pump relay coil with a relatively small current and I suppose you could have a wiring short or cross point short in the wiring from the ECU to the fuel pump relay. I think a short inside the ECU so bad that it blows a 15A fuse would mean it is toast. But a short in the wiring loom between the ECU plug and the relay box may be a life saver (for your ECU).
OK so there is something else to try first before moving on to check wiring between the ECU plug and everything else: Lets say you have a short in the fuel pump power wiring AFTER the relay. The relay is turned on by the ECU to power the fuel pump. Removing the relay would stop fuses blowing. Also, removing the ECU plug would stop the relay being turned on, so a short after the relay on the power side would not blow the fuse. Before you think the expensive ECU is dead (and that is a possibility), check out the wiring coming off the fuel pump relay for short circuits. I assume you have disconnected the fuel pump at the tank connector and you did actually disconnect the correct connector and not the fuel tank sender? In fact, with the ignition turned off,you should be able to poke your resistance meter across the terminals going back into the loom (relay) and in the opposite direction towards the fuel pump. The fuel pump should have a low resistance around 5 ohms. There should be no resistance measuring back from the pump connector to the relay box.
Also check the circuit diagram to see if the handlebar 'kill switch' has any wiring linked to the fuel pump relay. Some bikes have aftermarket theft alams fitted. I know my alarm has its wiring spliced into the fuel pump relay circuit and these alarm installers do not always do a decent wiring job and the alarm units can go faulty.
You need to stop blowing and replacing fuses or risk further expensive damage. Buy yourself a Clymer manual if you do not have one to study the wiring inter connections between the ECU connector and the relay box including the fuel pump.
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