I have a strange problem with my '06 Kawasaki ZX10. Turning ignition on cycles the fuel pump, and it shuts off after a few seconds, as expected. However, when the starter is turned on the pump does not cycle back on. If the starter is turned on immediately after the ignition is on the bike starts, then dies when the fuel pump cuts out in a couple seconds. Luckily, I have a second bike, and so far I've swapped with no effect;
Fuel pump relay.
Fuel pump.
ECU.
Battery is 12.5V, all fuses intact. A booster battery makes no difference.
If I turn the ignition on, wait for the pump to cycle off, then turn the key on and off again, the pump will cycle for a shorter duration the second time, but not at all on the third try. I have to wait 30-45 seconds until it the ignition will activate the pump again.
It ran fine 4 weeks ago. All I have changed is the installation of a electronic boost controller, which I unplugged, with no effect. I did have to root around the cramped tailsection to get it situated, but I can't see any obvious problems. I had hoped to go to dyno at MPS this Friday, and race next weekend at Maxton, so if possible I'd like to figure this out ASAP. Any ideas are appreciated.
Dean