POOG made my carb overflow!? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 16 (permalink) Old 08-05-2013, 09:30 AM Thread Starter
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POOG made my carb overflow!?

So I have definitely experienced the POOG and I think it even made fuel gush out of my air filter and it may be the root of my discomfort at cruising long distances.

At first I didn't think I was infected by the POOG virus then Saturday morning, early, I filled up and decided to take a cruise around the lake.

(For those who would like to follow along google maps.

https://maps.google.com/maps?saddr=T...sz=13&t=m&z=13

Click or paste the above).

I have to say, I've had the bike about two months and this was THE BEST it's ever driven. I was cruising wonderfully at 60-65 with no vibration - got over the 3500RPM buzz hump I guess. I get all the way around to what is about mile 30 maybe. I've been goosing the thing quite a bit in the previous 6 miles because I was following a Harley guy that was teasing me I think.

Well, this pup kept right up with him no problem and then we get to a light to turn left back toward home - Point E on the map. He takes the turn and really lays down on it. I follow suit and believe it or not this bike keeps pretty much right with him to about 70 mph and then I slow down for the next half mile. I was pushing prolly 6000-7000 RPM in there I'm sure.

So anyway, at this point, I start loosing power. I limp to the service station a half mile maybe and pull up under some shade - point F on the map. I smell gas. I look down at the K&N filter on my left (did ear shave) and fuel is gushing out of the filter. I take off the filter and start sopping the stuff up with a rag - I'm visualizing my bike in flames in the parking lot of the zippy mart.

I grab a big gulp (still legal here in South Carolina) and I sit down and thing in the shade. Been reading Zen and the Art so decided I needed to get right first and think about the problem.

I needed to stop the gas leaking so I turned off the petcock. I also disconnected the vacuum hose from the carb noticing that gas was coming out of it. So I was like, hmmm, too much vacuum in the line? I did notice last weekend that the manometer favored the front cylinder at higher RPMs. Then I decided I'd just turn the bike on and let it idle until it burned up all the fuel in the bowls - which it did. I was pretty proud that I had thought of that.

With the fire hazard taken care off, I put the vacuum hose back on, couldn't get the filter back on so just left it off and rode slowly home.

Later that day I go out again and the bike is running like total crap. I go maybe 10 miles to my new destination and stop the engine and hear a high pitched whine. I was like WTF? I bend down and the sound is coming from the GAS CAP! I wanted to jump up and down with joy. See I kept thinking that my bike was running like crap when it was hot after riding for a while. Nope, I bet it's the damn POOG thingy. Going to clean this pup and I bet you it runs great.

But! What about the fuel gushing out of the air intake you ask!? Well, I think that because I really hit that throttle hard, that the vacuum was awesome in that tank and it somehow got a big gulp of air on it's own because the vacuum over took the little thingy in the cap and with a whoosh, gas came bellowing into the system and over took the floats in the bowls.

What do you think?

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post #2 of 16 (permalink) Old 08-05-2013, 09:52 AM
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Sounds like you need to rebuild your petcock. Not supposed to be fuel in the vacuum line. The gas cap is supposed to make a little noise, means its venting.

I hated that overpriced stock pos petcock and replaced it with a non vacuum one from a tw200. I had just rebuilt the stock one and didn't throw it away. The internals are still good if you want it. Check yours first. Easiest way is to pull the fuel lines off & turn the valve to on. If there's no vacuum, fuel shouldn't come out.

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post #3 of 16 (permalink) Old 08-05-2013, 11:33 AM Thread Starter
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It was dripping but there may have been no actual fuel coming from the petcock. When I say the carb was full of gas, it was full up. The level was probably right at the vacuum hole. The bike runs great so I don't think there is an issue with the petcock. If the tw200 (I'll google it) works so well then I think I'll get one of those. I don't trust this vacuum stuff. To much vaccumming going on all over. I wish there was an "as seen on tv" universal fuel injector :-)

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post #4 of 16 (permalink) Old 08-05-2013, 11:34 AM
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I keep hearing about this poog thing. I think people fail to realize what even causes it since it has become so popular just to use the term poog. So, the cause is improper / not enough / no tank venting. Thats it.

How poog would make the carb overflow is beyoond me UNLESS the tank is filled, cold, then exposed to a hot area which will make the liquid inside want to vent out, but cant so it forces its way into the carb?


Sounds far fetched.


I think gas in your intake would be the sign of a float sticking, that would be my first guess.

don't these carbs have an overflow that drips out of the bottom? I know the old carb on my 1988 atv does, so did the carb on the little 70 atv, I do not know about my bike cause the float never stuck.

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post #5 of 16 (permalink) Old 08-05-2013, 11:43 AM
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Quote:
I think gas in your intake would be the sign of a float sticking, that would be my first guess.
x2

I had fuel flowing out of carb throat...turned out a small chunk of my air filter foam was stuck in float bowl needle valve...holding it open.
I replaced the needle valves as well as rebuilt the (Reserve / On / Prime) petcock which also malfunctioned .


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post #6 of 16 (permalink) Old 08-05-2013, 12:28 PM
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Quote:
Originally Posted by Goofyfoot2001 View Post
It was dripping but there may have been no actual fuel coming from the petcock. When I say the carb was full of gas, it was full up. The level was probably right at the vacuum hole. The bike runs great so I don't think there is an issue with the petcock. If the tw200 (I'll google it) works so well then I think I'll get one of those. I don't trust this vacuum stuff. To much vaccumming going on all over. I wish there was an "as seen on tv" universal fuel injector :-)
If its dripping from the vacuum tube, is it continuous or does it stop? If it is continuous, think about what it would do when you put a vacuum on it. If you have any clear tubing, use that for the vacuum line and see what's up with it running.

I can see how a stuck float could cause a problem but with it running, I would think that it wouldn't be enough with the engine running to overflow the carb.

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post #7 of 16 (permalink) Old 08-05-2013, 12:50 PM Thread Starter
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The vacuum tube is fine and no gas.

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post #8 of 16 (permalink) Old 08-05-2013, 12:53 PM Thread Starter
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Quote:
Originally Posted by Mercury View Post
I keep hearing about this poog thing. I think people fail to realize what even causes it since it has become so popular just to use the term poog. So, the cause is improper / not enough / no tank venting. Thats it.

How poog would make the carb overflow is beyoond me UNLESS the tank is filled, cold, then exposed to a hot area which will make the liquid inside want to vent out, but cant so it forces its way into the carb?


Sounds far fetched.


I think gas in your intake would be the sign of a float sticking, that would be my first guess.

don't these carbs have an overflow that drips out of the bottom? I know the old carb on my 1988 atv does, so did the carb on the little 70 atv, I do not know about my bike cause the float never stuck.

Kenny
I know my original post was a long one but toward the very end after I had goosed it as far as I think this bike will go. I think the vacuum that had formed in the tank let loose in a giant gush from the acceleration and that flooded the carbs.

To test this I will have to do a gas cap and vent tube clean and then hit it hard again and see if it still does the same thing. At the same time, I don't want to become a flaming ghost rider. :-o

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post #9 of 16 (permalink) Old 08-05-2013, 01:14 PM
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Quote:
Originally Posted by Mercury View Post
I keep hearing about this poog thing. I think people fail to realize what even causes it since it has become so popular just to use the term poog. So, the cause is improper / not enough / no tank venting. Thats it.

How poog would make the carb overflow is beyoond me UNLESS the tank is filled, cold, then exposed to a hot area which will make the liquid inside want to vent out, but cant so it forces its way into the carb?


Sounds far fetched.


I think gas in your intake would be the sign of a float sticking, that would be my first guess.

don't these carbs have an overflow that drips out of the bottom? I know the old carb on my 1988 atv does, so did the carb on the little 70 atv, I do not know about my bike cause the float never stuck.

Kenny
The vent tube which plugs into the right ear is the vent for the carbs. Overflow should push through that tube unless an extreme amount of gas is flowing wrong, than it'll back up out of the carb intake.

The vent tube out the back of tank is for venting the gas tank.

PO, you may want to check your oil for gas.

I only understand what I don't understand.
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post #10 of 16 (permalink) Old 08-05-2013, 01:16 PM
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Originally Posted by Goofyfoot2001 View Post

a giant gush ----------------- that flooded the carbs.
Nope.
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