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Discussion Starter #1
2006 gsxr 1000.

About 1000 miles on new fuel pump, its a generic one. I got it because of bad fuel flow I had, changed the pump and cleaned the filter and fuel flow is fine now. this just started about a week ago. Sometimes it sounds worse sometimes its not there ever. It also only happens after sitting over night or for a while, like when I'm at work. If I start it over and over within a few hours it will sound normal. I primed it twice in this video below and the first time you can hear it, it sounds like its sputtering or getting air in the system, then I prime again and its fine. one time I primed twice and it still made that sound.

Note* it will still start without hesitation on the first turn over even with that sound.



 

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Are you sure that it's coming from the pump and not something else like the EXCVA, STVA, or fuel pump relay?
 

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Discussion Starter #3
you heard it in that video? I'm willing to bet its the pump, besides does the EXCVA OR STVA stay off until I turn the kill switch on?
 

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I heard something but it was somewhat obscured by the background noise. The EXCVA and STVA, like the fuel pump, go through a start-up routine when the ECM gets power. That happens when both the ignition and kill switches are turned on.
 

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That sounds like the STVA clicking against the stops to me. I wonder why it only does it only sometimes, but it probably has something to do with the angle of the blades when the start-up routine starts. During the first cycle, for instance, they were probably closed from last shutdown, while on the second they were left wide open from the first cycle and, apparently, the ECM didn't bother re-cycling them. I haven't noticed such behavior on my K4, but, then again, I don't usually cycle power more than once before starting the engine.
 

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Yes, it does bang a bit more than usual. Badly adjusted STPS perhaps? Or maybe something's wrong with the fast-idle linkage. A video of the operation of the linkage (visible on the left side of the throttle body) during startup, might show something interesting.
 

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Discussion Starter #8
It's been about 3-4 days now and it hasn't done it since. So I'm not sure maybe you guys were right and it wasn't the fuel pump. bike (knocks on wood) is running great
 
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