CBR 600F 1987 - 1990 CBR 600F Forum

Doo I need a new pump?

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  #11  
Old 02-25-2013, 08:48 PM
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I actually was up at the bike this weekend (not working on it) and the fuel pump in it looked very similar to the one in my 88. It does have a Mitsubishi logo punched in it though...
 
  #12  
Old 02-26-2013, 03:02 PM
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Mines factory and has the Mitsubishi logo on it also which I thought was very strange. As far as gravity feeding it. I live in New England and with a foot of snow on the ground and up to 6 more tonight. Fixing it short term isn't really feasible. I did get the new points kit and will try to install that later tonight. And hopefully get the bike back together and running like new again
 
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Old 03-11-2013, 03:47 PM
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well, got the pump all back together with the new points kit and hooked back into the bike, the pump still isn't working correctly, I'm hoping that maybe I screwed up the soldered connection, and if I try and re do it that it will fire up with no problems. There is fuel up until the pump, and it was cranking without problems. Does anybody have an idea of what else could be a problem with the pump?
 
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Old 03-11-2013, 09:16 PM
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Make sure you have good ground and power while cranking at the fuel pump connector. If so check the points switch on the pump and make sure it's working while cranking also or it might be a bad connection there. If the points are switching back & forth it should start pumping fuel unless something else is damaged. It's been awhile since I had mine apart but I think there is a diaphragm inside that moves in/out to pump the fuel.
 
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Old 03-12-2013, 05:02 AM
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I know for a fact that the points arent moving. What could be causing this issue?
 
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Old 03-12-2013, 02:14 PM
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It means you possibly have no power at the pump.
If you can, hook it up gravity fed for a bit and get it fired up.
Take a multimeter and check for battery voltage at the connector.

If it's showing voltage take off the end cap from the fuel pump and clean/sand all the points of contact where the wires come into it

If it's not showing voltage then follow the wires back through the wiring harness.
Check out the fuel pump relay, if everything is okay there, then it's possible you have a pinched wire causing a short or open circuit
 
  #17  
Old 03-13-2013, 01:12 PM
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Where is the pump relay? I'm thinking that could be the problem because it happened 2 years ago too. My points are brand new so they shouldn't be dirty
 
  #18  
Old 03-13-2013, 08:18 PM
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Have you checked for power while cranking at the pump connector yet?
 
  #19  
Old 03-15-2013, 05:05 PM
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I have no way to nor would I know how to. Tahoe how would I go about that and what would I need just a circuit tester?
 
  #20  
Old 03-15-2013, 09:02 PM
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You will need either a testlight, or a multimeter from this point forward. you can get one for $20, but i believe no matter what route you take you will need one.

  1. you will need to remove your seat and tank
  2. follow the wire from the fuel pump to the harness, you should find a small 2wire connector. Unclip it
  3. Take your digital multimeter (make sure it is set properly. 20V DC)and attach one probe to either wire coming out. (harness end of the connector not the fuel pump side).
  4. turn on bike to on position and press the starter button.. you should see battery voltage on the multimeter
If no battery voltage is shown then the problem is further up the wiring harness
If voltage is shown then it's the fuel pump side
 


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