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So, my fuel pump still isnt priming, what gives???

  #1  
Old 09-13-2014, 10:43 AM
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Default So, my fuel pump still isnt priming, what gives???

I made a thread about this a while ago.... and I've been working on it ever since. Waiting for parts in the mail, installing them, fail... try again. I cannot get this damn thing figured out.
DOES ANYONE ELSE KNOW ANY OTHER OPTIONS FOR ME???
Here's what I've tried:
-Checked all fuses
-Checked all of my wiring... everywhere. I've gone up and down every wire on this damn bike looking for a short.
-New Bank Angle sensor, and also tried to just bypass it as well.
-New battery
-New relays
-New fuel pump
-Checked my kill switch (I've had to resolder a wire in there before.)
-Kickstand kill switch seems fine.
I have no idea WTF is going on. Power works fine, bike will try to crank. The damn fuel pump just wont prime. If I connect direct 12v power to the pump, it does work. Both my new pump and my old pump DO pump like they should when I put direct power to them.
The only other thing i can think of is if something went wrong with my ECU, but I REALLY hope not. Plus, if my ECU was going bad, would a few other things start to noticeably go out along with it? Hard for my to beleive this one issue all of a sudden came up out of nowhere with the ECU.

I'm at a loss.. and ready to just give it to a shop and have them deal with it. But i feel like i've already invested so much damn effort and time into it, I wanna do the damn thing myself just to feel like i conquered it!
Does anyone else have any other bright ideas I can possibly try out?
 
  #2  
Old 09-14-2014, 02:24 PM
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Have you checked the diode in the ignition switch ? It's an anti-theft deterrent.
 
  #3  
Old 09-14-2014, 03:11 PM
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I haven't checked that, I don't even know where to find it. I don't think that's my issue though, because I still have power at my fuel pump plug. If my kill switch was the issue, wouldn't power be cut to that plug all together? I am however only getting about 10.5 volts at that plug when it should be 12. Idk what is drawing power from that plug.
 
  #4  
Old 09-14-2014, 04:56 PM
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What's your V into the fuel pump relay?
 

Last edited by Conrice; 09-14-2014 at 04:59 PM.
  #5  
Old 09-14-2014, 06:16 PM
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Read through this thread. It has a lot of good information on places to check, expected voltages and the conditions under which you should find them.

https://cbrforum.com/forum/f4i-main-...l-pump-136231/
 
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