So the temperature here in the C-Bus (that's in Ohio, btw) climbed to an unsually balmy 45 the other day, which, when coupled with unexpected free time, had me on the bike. Everything was good (well, the parts I could feel, anyway), but towards the end of the ride I noticed a "pause" when acclerating. My fuel light was (and had been) on, and after a gas-up there was no problem. Thing is, next day I noticed the same thing, but I'm assuming gas wasn't an issue, since my fuel light was dark. I did just replace the gas tank before riding, and replaced the battery, but haven't everything seems to be ok. Could I simply have been low on fuel the second time, without the fuel light coming on? Should I check fuel lines? Everything seems ok, but, to be honest, I'm not an expert mechanic, by any means.
checking for a kinked fuel line would be the logical 1st step
I would check for both a kinked fuel line and kinked vent lines.
I checked the lines, and didn't see any crimped lines, but I did see what looks like a small leak where the fuel pump connects to the power supply. Strange thing is I experienced the problem today on the way to get gas (with low fuel light in), but had no problem after adding gas. It look consistently like the problem only occurs when the tank is low.
Next time you have the symptom open the fuel cap. If the problem goes away it is a venting problem.
You also may be running lean, have you changed anything lately?
open airbox? new pipes?
chain so loose it is skipping on the sprockets, missing teeth on sprockets?
(http://clubhousemotorsports.com/images/IMG_1294.jpg)
(http://clubhousemotorsports.com/images/IMG_1286.jpg)
I have had this happen more than once, had one jump off on the Dyno once, yeeha!
Only changes made have been a new gas tank and battery, so I'm thinking it's fuel-line related, maybe...especially since it only occurs when the tank is low, or at least when I haven't opened the cap...Once the temperature and my time allow for another ride, I'll experiment and see if I can pinpoint the issue. Thanks for the pointers! [beer]
When you installed the electric pump did you slide it all the way to the bottom of the bracket so the sock is touching the tank floor?
edit...
I don't think that is the problem. When a FI bike runs out of fuel...it runs out and quits.
The internal pipes in the tank have been known to clog.
If you're not running an emissions canister remove the little rubber do dah that meets the cap. That will allow the tank to vent.
You may want to check the fuel pressure also. I have seen split fuel lines inside the tank bleed off enough fuel to run lean.
same with checking clamps for looseness.
Low temps and a busy schedule have kept me from being able to really look further into this, but I did snap a pic of the where I believe there's a leak...if anyone can glean any ideas, any tips are appreciated!
(http://www.davidclarkson.net/tank.JPG)
Leaky tank?
see ducpainter.
buy some spray powder and look for were the leak starts.