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brute stops running 4 seconds after starting up??

06REDGRIZZ2010-08-12 15:11:56 +0000 #1
working on a buddies brute that not would even turn over let along run. after further investigation i found a broke wire that supplies the fuel pump relay it's power. fixed that and now it turns over and runs for 4 seconds and dies. you know when u turn the key on and can hear the fuel pump run then turns off well thats how long it runs. you can feel the relay cut off then the bike dies. so what tells the fuel pump to stay running. a already put my cdi on the bike and I know it works and it does the same thing so that's out of the question. so what elese is there. I need yalls help.
hoover2010-08-12 15:23:36 +0000 #2
maybe the rollover switch? not sure
phreebsd2010-08-12 15:32:11 +0000 #3
Does the FI light flash on the display ONLY while turning it over trying to crank?
06REDGRIZZ2010-08-12 16:16:16 +0000 #4
no the fi light does not flash at all. and i have taken the roll over switch off and shaked it and still the same thing. but the pump is turning on at start up but cuts off after four seconds and never comes back on until you turn the bike off and turn it back on
06REDGRIZZ2010-08-12 15:29:47 +0000 #5
like its only priming and running off of that fuel for those few seconds
06REDGRIZZ2010-08-12 16:01:26 +0000 #6
i might need to add that before i received the bike the owner swapped out all the electrical components to try isolate the problem so something may be unplugged that im not seeing.
650Brute2010-08-12 16:52:02 +0000 #7
Hmmm, I am stumped. Esp with swapped CDI's and the same thing.

Maybe just a bad fuel pump? How does that work, after initial priming and start up?
Rack High2010-08-12 18:27:22 +0000 #8
Could be either water/sand in the gas tank or a clogged fuel pump screen. I'd check from that point forward all the way through to the injectors if you feel that, on the electrical side (wiring) the bike is sound. 9 times out of 10 it's' not electrical IMO. Has the bike ever been sunk?
hoover2010-08-12 16:52:41 +0000 #9
Fuel pumps are designed to cut off at a certain pressure, and kick back on at a certain pressure...just a thought



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