Ok. I need some brains... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

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post #1 of 17 (permalink) Old 05-21-2007, 11:00 AM Thread Starter
 
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Ok. I need some brains...

This was interesting. I went for a ride the other day after work all of maybe 7-10 miles MAYBE and I lost 1/2 a tank of gas?!?!?! What the crap would that be about? It's a 93 with vance and hines and K&N filters. Any ideas?
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post #2 of 17 (permalink) Old 05-21-2007, 11:23 AM
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Well if there were no obvious signs such as the smell of gas, and leaking from a bad or loose hose, then my guess would be the float was stuck and became.. unstuck
A half of tank of gas within 7-10 miles would have flooded your carbs if it was getting there.

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post #3 of 17 (permalink) Old 05-21-2007, 11:53 AM
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Was it actual loss or just gauge movement?

I've got to the point where I ignore the gauge as it doesn't seem to drop off much until the last 15 or 20 miles of the tank. It's nice to have on a bike, but it can give a false sense of security and leave you in a bind if you rely on it.

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post #4 of 17 (permalink) Old 05-21-2007, 12:15 PM Thread Starter
 
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It was definitely loss. Diana...Everything checked out...I wasn't sure what could be causing that and my LAST guess what have been from the floats....I think that may be causing the problem when highway cruising and stalling out too...I had suspicions but was never sure...
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post #5 of 17 (permalink) Old 05-21-2007, 01:40 PM
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Ooooops! Let me clarify.. I wasn't talking about carb float.. I was talking about fuel gauge float, or probably better known as the float connected to the fuel gauge
seen here in the bottom right hand corner
http://www.ronayers.com/fiche/400_04...0&parent=10700

Our fiel gauges are also slow to start moving and seems like you go through the first half of the tank and think.. "Dang I'm getting good mileage!" then it reaches that point and seems to drop like a rock. Then mine seems to run in the red zone almost as long as it did over on the full mark.

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #6 of 17 (permalink) Old 05-21-2007, 02:46 PM
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Quote:
Originally Posted by Dianna View Post
Our fiel gauges are also slow to start moving and seems like you go through the first half of the tank and think.. "Dang I'm getting good mileage!" then it reaches that point and seems to drop like a rock. Then mine seems to run in the red zone almost as long as it did over on the full mark.
I only pay attention to my fuel gauge for a general idea of what I've got left in the tank. For a more accurate idea of how much I have, I go by mileage.
My truck fuel gauge is the same way. I can easily get to 200mi on 1/2 tank (gauge reading) but the gauge is showing nearly empty at 270mi, when you'd think I could get to 400.

But, only 7-10 miles on what the gauge shows as 1/2 tank does seem kinda odd.
Mike, was it the last 1/2 tank that seemed to go so quickly? Also, did you fill up afterwards to figure out what your mileage was?


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post #7 of 17 (permalink) Old 05-22-2007, 04:23 PM Thread Starter
 
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No. I didn't fill up again...but it actually seems like the tank gauge is accurate...there's almost no gas in the tank...I threw two gallons in it after I cleaned the tank and there is less than a 1/4....:-(
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post #8 of 17 (permalink) Old 05-22-2007, 05:59 PM
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I'd pull the tank and see if you've got a crack or leak someplace. That's really, really weird, but, hey, it's a machine so anything can happen.

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post #9 of 17 (permalink) Old 05-22-2007, 06:01 PM
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WAIT - Whereabouts do you work?The last time gas jumped this high, folks were having their tanks siphoned all over the DC area, even out here in the country. I know we have locks on the gas caps, but they've gotta be easy to pick. I wouldn't rule that out at all.

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post #10 of 17 (permalink) Old 05-23-2007, 08:37 AM
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I put it down to the people who installed the fuel guage, who assumed the tank had straight sides and is the same volume all the way down. In fact the tank is taperered and has a chunk out it at the bottom where it straddles the frame. So the first half lasts for ages but as you get through the second you can almost see the needle moving. Someone wasn't paying attention there.
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