Gas leaking from on high in the carb - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 09-01-2015, 07:06 PM Thread Starter
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Gas leaking from on high in the carb

Hello, all. First time posting so here's a little background.

Bike is a '98 750 with about 10K on it. We've had it for a few months and it had been sitting in a garage for about 3 years prior to that. Had problems initially starting it, brought it to a Kawasaki dealer, and the carbs were rebuilt. Had a gas leaking issue shortly thereafter, brought it back and they "fixed" the issue saying something was stuck (float?).

For the next 2K miles no issues and now it's leaking again. When I open the choke it literally flows. It's coming from the highest point of the left side carb that I can see without pulling the tank. Shut off valve is in the off position. I'm puzzled that the gas continues to flow and neither the float (stuck again??) or shut off valve stops the issues.

I'm somewhat mechanically inclined, at least with cars, so not afraid to give it a go myself. Anyone have an idea as to just what is going on?

Much thanks in advance!

Last edited by RMBC73; 09-01-2015 at 08:01 PM.
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post #2 of 8 (permalink) Old 09-01-2015, 10:37 PM
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Check for gas inside the vacuum line that runs from the left carb to the petcock. It should be dry. If it is wet, it's filling the carb through that line via a leaking petcock diaphragm.

The fact that you can't shut it off, makes me think the petcock needs rebuilt or replaced.

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post #3 of 8 (permalink) Old 09-03-2015, 06:25 PM Thread Starter
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Thanks, that makes sense considering it sat for 3 years and things dry out. I'll check it over the weekend and let you know.
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post #4 of 8 (permalink) Old 09-04-2015, 12:12 PM
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Also that you have the petcock shut off position at parallel to the ground and not in the up position.

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post #5 of 8 (permalink) Old 09-04-2015, 05:28 PM Thread Starter
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So, yes, the petcock is in the parallel position with the "handle" pointing towards the rear of the bike.

I pulled the line that goes from the petcock to the left carb and it is full of gas. As long as that is the vacuum line then, as suspected, the petcock needs to be replaced.

Thanks!
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post #6 of 8 (permalink) Old 09-04-2015, 05:58 PM
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You're on the right track, and you're welcome!

There is the option of using a PW200 petcock, that does away with using vacuum. Should be a few posts about doing that. Ebay usually has a good deal on rebuild kits for the stock one.

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post #7 of 8 (permalink) Old 09-05-2015, 01:07 PM Thread Starter
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Ordered a rebuild kit and found the post with the steps to remove the gas tank. I should be all set!

Thanks again
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post #8 of 8 (permalink) Old 09-12-2015, 06:05 PM Thread Starter
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Installed the rebuild kit today and so far so good, looks like that was the culprit.

Thanks again!

Last edited by RMBC73; 09-20-2015 at 11:49 AM.
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