groffster99 7 #1 Posted June 20 Hello, I have 520xi, that will start and run for about 3 seconds, then it stop. I can pour gas in the top of the carb and keep it running. I also pulled apart the carb as much as I could and its clean and getting full. I think it might have something to do with the keihin carburetor fuel solenoid. Can those be bypass. Either by deleting it or somehow getting it to remain open all the time? I don't have much experience with carbs with electrics in them. Or does anyone have any other ideas? I'm at a lose. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,442 #2 Posted June 20 You should be able to feel and hear the fuel solenoid when it opens. Get a hold of it and turn the key to the run position and see what is happening. It is powered by the start terminal on the ignition switch when starting and that circuit must be OK because it cranks. It is powered by the rectifier circuit when running through a 25 amp fuse. Both of these circuits have a diode most likely in the harness close to the solenoid so when one is powered it does not back feed into the other. 1 Share this post Link to post Share on other sites
groffster99 7 #3 Posted July 3 (edited) Thanks gwest. I appreciate the help. sorry, I was away with work. Got back late last night. I'll look that over tonight. edit: I just went out and looked. I get no sound or vibrations from the fuel solenoid on the bottom side of the carb. I also check the fuse that I know of and it was good (I only know of the fuse box behind the dash on the right side. holds 4 fuses, a 30, a 25 and two smaller ones. picture attached). Is there a second fuse panel that I might need to check? I'll have to find the diode on the rectifier circuit and check that. Are the diodes replaceable or do you have to get a new harness or something like that? Is there a way to bypass the solenoid, remove it or alter it so I can validate my issue? Or do you have to purchase a new carb for that? Edited July 3 by groffster99 Share this post Link to post Share on other sites
groffster99 7 #4 Posted July 3 So my problem is the fuel solenoid not opening. I was able to pull the carb off, pull off the solenoid and block it closing with a staple. Put it back together and bam...engine fired up and ran. I'm going to replace that solenoid and hope that its not electrical. I'm not good with testing electric. Thanks for the help. Share this post Link to post Share on other sites
953 nut 59,748 #5 Posted July 3 6 hours ago, groffster99 said: I'm going to replace that solenoid and hope that its not electrical Before you spend money on a new one you could test the one you have. Ground the body of the solenoid to the negative terminal of your battery and touch the terminal with a wire connected to the battery positive. If it is good the little needle will move in about a 1/16", if nothing happens it is bad. If the fuel solenoid tests good you can run a couple of easy checks on your wiring. There should be 12 volts + to ground on the wire to the solenoid in the start position and with the engine running' Hope this is helpful. 1 Share this post Link to post Share on other sites
My_horse 16 #6 Posted July 4 I ground the tip off one on a jd 325. Then unplugged it. Never had an issue again. 2 Share this post Link to post Share on other sites
groffster99 7 #7 Posted July 4 Thanks nut. That is something I can do now that you mention how. My_horse, that was actually my new plan after thinking about it for a while. They are not cheap. 1 Share this post Link to post Share on other sites
