Petcock function - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 7 (permalink) Old 03-28-2012, 12:44 AM Thread Starter
Ndr
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Petcock function

So I rebuilt my petcock today.

One thing I noticed was that when draining the tank through the petcock into a can, gas only came out of one of the two hoses. I had attached a length of spare tubing to the outlets and applied vacuum to the center port on the petcock.

Is one hose meant as a feed for fuel and the second a vent tube? Or do I perhaps have a clog in one of the internal channels of the petcock. After disassembling, cleaning and reassembly with new gaskets, I have the same function.

when letting gas drain through the petcock, I only get a flow through the one hose. If I block off the second hose with my finger, the flow from the first tube slows, but doesn't completely stop. when i let go of the second hose, I get a small backflow of gas through that hose, but no more then a teaspoon full or so.

......I'd rather wake up in the middle of nowhere then in any city on earth.

*2014 VN900 Custom (16,200 miles and counting)
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post #2 of 7 (permalink) Old 03-28-2012, 06:15 AM
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Interesting. I have never drained my tank like that, but I would think gas would come out both hoses, as one hose goes to both carbs. Will be interesting to find out the answer.


"I'd rather wake up in the middle of nowhere then in any city on earth." Steve McQueen. One of my favorite quotes. I hate the city with a passion. Probably why I take the most direct route OUT of it when I get on my bike.

I am a motorcyclist, NOT a biker.


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post #3 of 7 (permalink) Old 03-28-2012, 07:33 AM
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I would guess something is wrong. You should have fuel flowing from both hoses.

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post #4 of 7 (permalink) Old 03-28-2012, 12:20 PM
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For that much fuel flow demand, I hope you got the gas cap open.

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post #5 of 7 (permalink) Old 03-28-2012, 06:59 PM
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yes there is a problem... fuel should pour out of both holes with the same amount of fuel and pressure.
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post #6 of 7 (permalink) Old 03-28-2012, 07:12 PM
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You definitely have problems. I rebuilt my petcock only to have it leak a few weeks later. I ended up purchasing a PINGEL High Flow petcock.

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post #7 of 7 (permalink) Old 03-29-2012, 12:30 AM Thread Starter
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Thanks guys, I figured that wasn't quite right. I guess I'll be playing around with it a bit more.
Oddly, it seems like both cylinders are both firing fine, so gas is getting into both carbs fine somehow. Gonna have to try it in the morning after work, but I have a thought that with both hoses hanging to open air, it might simply be a gravity thing. Water flowing downhill and such...

Quote:
For that much fuel flow demand, I hope you got the gas cap open.
Yup, definitely had the gas cap open. seemed like a no brainer to me...

Quote:
I hate the city with a passion. Probably why I take the most direct route OUT of it when I get on my bike.
I might live here in the city, but I don't have to like it.

......I'd rather wake up in the middle of nowhere then in any city on earth.

*2014 VN900 Custom (16,200 miles and counting)

Last edited by Ndr; 03-29-2012 at 01:12 AM.
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