2000redrocket
Pro
Posts: 1662
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posted May 27, 2011 08:59 AM
anyone have a fuel pump fail?
i tried todds iap sensor . it did not help.
the thing that seemed to help is putting my origional ecu in
then it was stupid ritch down low bla bla bla but still a tad lean on top
like 15 to 1
i reflashed my hacked ecu and it is now back to its normal driving but it
leans out on top end progressively and around 10,600 or so it gets real lean fast. and i lost my nice afr curve.
i am thinking my fuel pump and or the filter in the tank may be a issue.
  
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Paul2281
Expert Class
Posts: 147
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posted May 27, 2011 09:06 AM
 Edited By: Paul2281 on 27 May 2011 19:54
What the inj. duty showing at full throttle???? Stock fuel pressure....
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tcchin
Zone Head
Posts: 867
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posted May 27, 2011 10:19 AM
Fuel pumps fail all the time. Have you done a pressure/volume test on the pump?
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shiphteey
Needs a job
Posts: 2529
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posted May 27, 2011 12:17 PM
Not yet, knock on wood. Rocket, are you still running the OEM 2000 pump? I think I found mine sitting around in a plastic bag the other day, its yours if you want it, I owe you for the fender still...
A.
____________
Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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2000redrocket
Pro
Posts: 1662
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posted May 27, 2011 01:51 PM
ship i will get back to you. i am now trying to figute how to hook up a fuel pressure guage i can watch under full load.
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tcchin
Zone Head
Posts: 867
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posted May 27, 2011 07:16 PM
Just follow the service manual's protocol for testing the pump. That's a lot easier.
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2000redrocket
Pro
Posts: 1662
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posted May 27, 2011 08:48 PM
ok i will have to find that
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motojoeyt
Novice Class
Posts: 75
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posted May 30, 2011 08:32 PM
Hi red rocket,
I had my oem fuel pressure regulator go bad. It coud keep up till about 10k then shit the bed. Once I put a aftermarket fuel pressure reg it worked perfect.
Let us know what you find out,
Joey
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8.81@154 DOT/Pump full street bike
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2000redrocket
Pro
Posts: 1662
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posted May 31, 2011 01:28 PM
i am thinking i may need to get dyno time to check the pressure. i got a test kit and a T to put in the fuel line. i just can not imagin how to watch it under load riding it.
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motojoeyt
Novice Class
Posts: 75
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posted May 31, 2011 02:11 PM
Red rocket,
Mine would shit the bed on the lift just revving it up. You might be able to test it in the garage with the gauge and see what it drops down to.
FYI mine oem was 44psi at idle and drop to 32psi at redline
Joey
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8.81@154 DOT/Pump full street bike
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tcchin
Zone Head
Posts: 867
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posted June 02, 2011 08:13 AM
Why would an analog fuel pressure regulator be dependent on engine speed? Even with a vacuum port, there should be no difference in regulated pressure from 10% to 100% throttle once you're past idle.
In brief, if you test your open-loop fuel pump output volume at the bypass port on the regulator with the engine off, you will see how much max flow you have at the regulated pressure. If there's not enough flow to support your fuel consumption requirements (plus a safety margin), then the pump is bad. If the line pressure between the regulator and the pump drops while there is still flow past the bypass valve, then the regulator is bad.
As always, please refer to your service manual for the official test procedure.
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