Fuel coming out of vacuum port. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 13 (permalink) Old 02-03-2012, 04:23 PM Thread Starter
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Fuel coming out of vacuum port.

My bike started acting funky... I swear this bike hates me, I put nice stuff on it to fix it and it immediately acts up! lol.

So I was riding to work and suddenly it started to die on me. It wouldn't idle but I kept it alive by giving it some throttle when I had to stop.

If I stopped and didn't open up the throttle a bit, it would idle for a few seconds then the RPMs would go down until it died.

I got it home after applying the same technique and parked the bike. Went to my 2nd workplace by cab and when I came back there was a puddle of gas beneath the bike.

Started looking for the source of the leak and when I unplugged the vacuum port on the right carb, fuel came streaming out of the vacuum port.

Doesn't seem to have happened with the left carb, though maybe that one drained completely by the time I got home?

So anyway, what do you guys think about this? I'm pretty sure I'll have to take the carbs off AGAIN u_u

1985 VN700 unknown mileage (over 33K)

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post #2 of 13 (permalink) Old 02-03-2012, 05:24 PM
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I would think that the float in that one carb is stuck. Check the plug on that cylender and see if it is black, running rich. On the left carb you can check to see if it has fuel by draining the carb by the drain at the bottom of the carb.

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post #3 of 13 (permalink) Old 02-03-2012, 10:13 PM
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Are you sure it wasn't that new "puck" LOL, By the way pay pal came thru quick!

04-3,200 miles bought July 2011 with 928 miles. Loaded with acessories to many to list here, see my albums for more details! I also make a custom tank bib specific for the 750 if anyone is interested, ck my albums for some pics.
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post #4 of 13 (permalink) Old 02-04-2012, 01:13 AM Thread Starter
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Quote:
Originally Posted by romeobravo172 View Post
Are you sure it wasn't that new "puck" LOL, By the way pay pal came thru quick!
I think it was... I think my bike is so spoiled it acts up even when I'm trying to fix it! lol

I'm gonna start checking out stuff tomorrow. I'll report if there was still fuel in the other carb and if I see any obvious stuff wrong with the carbs.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #5 of 13 (permalink) Old 02-04-2012, 04:10 PM
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What do you mean by "vacuum port"? There is only one vacuum port, or connection on each carb. The front one is connected to the vacuum operated petcock. the rear one is either capped off, or connected to the air injection system. I don't see any way gas could leak out of either one of these.

I am a motorcyclist, NOT a biker.


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post #6 of 13 (permalink) Old 04-24-2013, 04:12 AM
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Same Situation here, fuel broke down rubber vac cap

Noticed fuel leak and found vacuum cap on rear (right) carb has been melted by fuel, pulled off rotten cap and fuel coming out of port, especially when I turn the throttle...Seems like diaphram or stuck float, but wondering what "ceal" found.....I know this is an old thread, I might have to start another one.

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post #7 of 13 (permalink) Old 04-24-2013, 11:26 AM
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I think Ceal's was the one that was leaking fuel through the petcock and into the vacuum hose. Sounds like you're at least coastered, so it must be a float problem.
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post #8 of 13 (permalink) Old 04-24-2013, 11:36 AM
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Quote:
Originally Posted by Spockster View Post
I think Ceal's was the one that was leaking fuel through the petcock and into the vacuum hose. Sounds like you're at least coastered, so it must be a float problem.
I had a slight leak with the Petcock....also noticed slight amount of fuel getting sucked thru the vacuum, I rebuilt petcock... stopped the leaks.

....just sayin'

x2
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post #9 of 13 (permalink) Old 04-24-2013, 12:11 PM Thread Starter
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Mine was on the rear carb as well, not the front one that goes to the petcock.

In all honesty, I can't remember what I did to fix it. I wonder if this is when I parked my bike for months last year... can't remember. This is exactly why I'm trying to come back and explain what fixes my problems on my newer threads lol.

I know for a fact that I replaced my petcock, and I know for a fact that I didn't buy any carb diaphragms or any other carb parts. So that leaves a stuck fuel float as the problem... or the leaking petcock somehow made the rear carb flood? Less likely, I think.

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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post #10 of 13 (permalink) Old 04-24-2013, 12:36 PM Thread Starter
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Looked at some of my older posts, and what I did was take off the carbs, disassemble them and clean them, then put them back in. So yes, it was a stuck float!

1985 VN700 unknown mileage (over 33K)

AGM Battery
Iridium spark plugs
NGK wires and caps
Relocated R/R
Marbled
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