Fuel delivery - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
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post #1 of 5 (permalink) Old 12-12-2015, 09:35 PM Thread Starter
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Fuel delivery

My wife got me a bike for Christmas! 92 Vulcan 750. Guy we got it from said only problem was the float in the tab corroded into pieces clogging the fuel lines. I took off tank and removed petcock and saw the attached filter was the thing that corroded to pieces. I removed that and cleaned it all up added some has and turned the petcock on on, res, and prm, and no fuel would come out of the petcock. I could successfully blow air through the petcock inlet to outlet but gas wouldn't flow through. Gave up and just put it back on the bike and she about 30 secs of cranking the bike fired up and ran fine. Do these petcocks work off of vacuum? I'm used to just turning petcock on and seeing fuel flow freely. So are these petcocks vacuum activated? Also even when warm bike takes about 30-45 seconds to start then runs fine.
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post #2 of 5 (permalink) Old 12-12-2015, 09:50 PM
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Welcome to the nucking futhouse. Yes they are vacuum activated,but should start up quicker than that.do you have an agm battery and does it backfire while trying?

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post #3 of 5 (permalink) Old 12-12-2015, 10:17 PM Thread Starter
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not sure what kind of battery I haveand no it does not backfire it sounds like it is not getting fuel but once I press the starter for long enough it fires up and runs just fine idles good and everything
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post #4 of 5 (permalink) Old 12-13-2015, 10:35 AM
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There might be able pieces of crap from the tank inside the fuel lines or in the carbs restricting fuel from filling the carb when you go to start it, but take my that long to start seems wrong.
Are you using the choke? What grade of gas are you using?

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post #5 of 5 (permalink) Old 12-13-2015, 11:20 AM Thread Starter
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Yes when cold I choke when warm I don't doesn't matter still take 30-45 secs, will clean out carbs and lines with tune up and see if that helps.
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