Help! Vacuum hose on petcock - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 35 (permalink) Old 08-17-2013, 07:38 PM Thread Starter
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Help! Vacuum hose on petcock

I bought a 2001 Vulcan 750, and it was torn apart. I got it back together and it runs good, but it runs out of gas in about a block. I think the hose that goes to the petcock vacuum fitting which points straight down, is coming from the wrong place. Where is the other end supposed to go?

I sure could use a new petcock, because the screen on the reserve side is broken. If anyone has an extra petcock, I'll buy it from you.
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post #2 of 35 (permalink) Old 08-17-2013, 07:46 PM
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First post? Welcome to the forum!

The vac hose comes from the vac port on the left carb (front cylinder) to the port that faces downward on the petcock.

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post #3 of 35 (permalink) Old 08-17-2013, 08:28 PM
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Heres a crappy picture that might help confuse you.


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Last edited by Goofyfoot2001; 08-17-2013 at 08:38 PM.
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post #4 of 35 (permalink) Old 08-17-2013, 08:35 PM Thread Starter
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Yup... That's how it was plumbed, dammitall!!! I guess that means I have a bad diaphragm or I need to clean the carbs better.

Thanks so much to the both of you, for the help. I appreciate it.
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post #5 of 35 (permalink) Old 08-17-2013, 08:56 PM
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Will it idle for longer than a blocks worth of gas? If so, not the petcock.

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post #6 of 35 (permalink) Old 08-17-2013, 09:17 PM Thread Starter
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Yes. It idles and revs, but when I try to ride it, I only get a block or so and end up pushing it back. Starts again with the choke on, but won't stay running.
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post #7 of 35 (permalink) Old 08-17-2013, 10:38 PM
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Quote:
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Yes. It idles and revs, but when I try to ride it, I only get a block or so and end up pushing it back. Starts again with the choke on, but won't stay running.
Have you taken apart the ignition switch under the key and cleaned and stretched the springs? I say this because my bike would idle all day but while riding would shut off. Not bumps in the road either. That switch does strange things to the bike.

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post #8 of 35 (permalink) Old 08-18-2013, 12:23 AM
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The petcock on the Vulcan 750 (unlike on Hondas) is rebuildable. I've had to rebuild mine a couple of times due to leaks. I believe the problem was caused by ethanol gas. The rubber parts I replaced appeared to be melted.

I am a motorcyclist, NOT a biker.


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post #9 of 35 (permalink) Old 08-18-2013, 12:36 AM
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Open the fuel cap and leave it open. Ride a bit and see if it still happens. Sounds like a dirty cap aka poogs.
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post #10 of 35 (permalink) Old 08-18-2013, 07:29 AM
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Quote:
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Open the fuel cap and leave it open. Ride a bit and see if it still happens. Sounds like a dirty cap aka poogs.
I never could get that last little diaphram am off my cap but so far cleaning the cap and blowing compressed air through the vent hole seems to have cleared my occasional flub blub. So alls im going to say. Is CLEAN DAMN EVERY FLIPPIN THING ON THE BIKE.


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