I am going to give a little back ground to my problem in case it is somehow relevant. I had my bike apart getting it track ready. I had the tank off, and re-routed my electronics in the tail section. As far as that goes, the only thing I really moved was my converter unit. It is now behind the battery in the tail section. I also put my power commander and speedo healer in the same location, kind of sandwiching them all together. I then wanted to do some street riding before my upcoming track day, so I put it back together. Tank back on, etc. I rode 200 or so miles without a problem. When I was coming home, it cut out a couple times, really quick and came back on. The FI light flashed each time. I pulled over, tighten my battery connections and moved the converter unit on the other side of the PC away from the battery in case the metal on it was somehow crossing the neg and positive and shorting out the battery. (doubt this was the problem, but hey was trying anything) The terminals were a touch loose and this fixed the problem. No more issues for 150 or so more miles.
Then, I decide to ride it to work today. Go to start it and nothing...it just turns over but won't fire. I just sit there with the key on thinking what could be going on and I hear the fuel pump prime. (I must have not noticed it not priming earlier) It fired right up and no issues on the way. When I went to leave, the same thing happened, although I listened for the fuel pump this time. Turned key on....nothing. Waited a min and it primed. I have since gotten it to replicate several times, while other times it primes immediately.
I am now thinking possible fuel pump issue or connection issue, but would think it would not just be a delay in priming the fuel pump and would cause issues while riding, but it seems to be fine once it starts.
Anyone have any clue what could be going on? Any help is appreciated.
weird,exactly what mine did yesterday.checked all connectors,battery,unplugged pc,grounds etc.kept trying and then heard the pump relay buzzing.gave it a couple of knocks and it primed.would check there first.
it's in the tail on the sp1,right rear corner,not sure on sp2.it's a fuel cut relay so must be in the loop with bank angle sensor and bank angle relay(left rear corner sp1) so they may be worth a look at too.
fuel cut relay has a couple of browns,bank angle relay has a couple of reds into it.should help you identify them.
I had exact same problem on mine (turned out to be a broken wire between the ECM and the fuel pump relay, your fuel pump relay is on the back right and to test it you can swop it with the relay on the opposite side which is identical.
Now when I try to figure out what is going on, it acts fine. I wonder if I should just buy a relay in case it decides to go bad at a track day or something.
Well, I think I figured out the problem...hopefully. I went to look everything over again and when I was checking the wires, the fuel pump connector came apart with little force. It evidently was not all the way the plugged in.
Ok....this sux. It is doing it again. Just out of no where. All the connections are intact, so it must have just been a fluke before. When it won't prime, the relay is not clicking. When I swap out the other relay to see if that fixes the problem....nothing. It must be something before the relay. Any other ideas what this could be? It is driving me crazy not knowing if my bike will start or not when I go to ride.
Check your kill switch and the wires by the kill switch. I have had similar problems with the kill switch and the wiring coming out of the switch (zip tied too tight by factory). This might be your issue. If you wiggle the wires around and notice the pump priming off and on, that's your issue.
Check your kill switch and the wires by the kill switch. I have had similar problems with the kill switch and the wiring coming out of the switch (zip tied too tight by factory). This might be your issue. If you wiggle the wires around and notice the pump priming off and on, that's your issue.
I did notice when I was messing with the kill switch, it would prime on and off, but I figured if there was a problem there, it would cut out while riding. Am I wrong with this?
I did notice when I was messing with the kill switch, it would prime on and off, but I figured if there was a problem there, it would cut out while riding. Am I wrong with this?
I've never had it cut out while riding, I have, however, had it not start due to this issue with the kill switch wiring. It was intermittent when it first started, would work fine, then one day wouldn't work. Took a little while to figure out.
I've never had it cut out while riding, I have, however, had it not start due to this issue with the kill switch wiring. It was intermittent when it first started, would work fine, then one day wouldn't work. Took a little while to figure out.
I had exactly the same problem, when switching to the race harness. I would put the stock harness back in and the fuel pump would prime. I was convinced there was something the ECU was not happy about.
One day I decided to check the voltage at pin A8 and all of a sudden the fuel pump came on. Then the next time it would not. I had spent many hours studying he wiring diagrams, checking grounds, testing relays. Nothing worked, except the stock harness.
It turned out to be a loose socket at pin A8 on the plug on the wiring harness! I bent the pin slightly on the ECU and it works every time now. It was a difficult problem to diagnose, because the connector is all tied together.
I couldn't believe that was the problem. It ended up being an expensive lesson, as it indirectly put me on the ground (long story. I told it a while ago).
Fuel Pump not Priming
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