Failed fuel guage - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 17 (permalink) Old 05-14-2011, 01:27 PM Thread Starter
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Failed fuel guage

When I started the bike up earlier this year, early April, everything was fine. A couple of weeks ago I started ir for a potential buyer, and the fuel gauge was not working. When the key is turned on, the gauge lights up, and the needle actually goes down from it's off position. I know the tank is over 3/4 full. Is this a failed sending unit? Or an electrical short or break?

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post #2 of 17 (permalink) Old 05-14-2011, 03:33 PM
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Hi: I can't think of a reason why the guage would go lower than E unless the polarity were reversed somehow. Any way, check the wiring first for continuity. If no faults are found then the sending unit is most probable cause. It could be mechanically stuck down, which seems unlikely, or an electrical fault. The resistance should change in relation to float position, which you can test if you remove the sending unit, with a multimeter.
If still no fault found, then the guage itself may be the culpret.
Hope others have input or experience with this. I will follow the thread to learn from your findings.
Bronson

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post #3 of 17 (permalink) Old 05-15-2011, 11:53 AM
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Seems to be a common problem, mine wasn't working when I got it. It ended up being a broken connection in the sending unit in the tank. I was able to solder it back together after a few hours of monkeying. I suggest pulling the sending unit and checking resistance across the sweep of the float, and then you might have to test your patience opening it up and finding the break, it can be done, mine is still working .... for now.

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post #4 of 17 (permalink) Old 05-28-2011, 11:23 AM Thread Starter
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The part that confuses me it that the needle moves to below "E" when the key is turned on. That seems like it is getting a signal from somewhere, so I am tending to doubt the bad fuse/broken connection theory. But, I'm by far no expert. Is there a simple way to check for a stuck float? And to free it?

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post #5 of 17 (permalink) Old 05-28-2011, 11:42 AM
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The easiest way to check for stuck float (but not the neatest) is to pull it from the tank and physically check it. At that point you could reconnect it to the bike and move the arm and see if the needle moves.

87 vn750at least that is what the frame #'s say
"Squirrel Bike" aka Jersey

Rat bike with a good PR agent

shaved and coastered
2 into 1 exhaust
rear 170 and front 110
Relocated R/R
custom dash with voltmeter
Spitfire windscreen
Plutonium plugs
Recovered seat without "butt hammers"
More to come
Praise to the Parts Goddess Crobins for needed things

When someone tells me "Great minds think alike" all I can think is "You Pervert"
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post #6 of 17 (permalink) Old 05-28-2011, 12:49 PM
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Can you see inside the tank with a flashlight, then reach in with a piece of wire to move the float lever?

Gordon

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Purchased May 16, 2008
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post #7 of 17 (permalink) Old 05-28-2011, 03:12 PM
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Quote:
Originally Posted by OlHossCanada View Post
Can you see inside the tank with a flashlight, then reach in with a piece of wire to move the float lever?
There I go overthinking again ... too eager to grab wrenches .....

87 vn750at least that is what the frame #'s say
"Squirrel Bike" aka Jersey

Rat bike with a good PR agent

shaved and coastered
2 into 1 exhaust
rear 170 and front 110
Relocated R/R
custom dash with voltmeter
Spitfire windscreen
Plutonium plugs
Recovered seat without "butt hammers"
More to come
Praise to the Parts Goddess Crobins for needed things

When someone tells me "Great minds think alike" all I can think is "You Pervert"
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post #8 of 17 (permalink) Old 05-28-2011, 05:07 PM
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Mine had a broken connection like dragon was describing. There is an "L-like" piece in there that broke right at the bend. I too was able to solder it back after an hour so of rigging. I think I actually wound up drilling a hole in the base, screwing in a small screw and soldering to that. I could not get solder to stick to the brass/copper parts.

1995 VN750 - 10K
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post #9 of 17 (permalink) Old 05-28-2011, 10:29 PM
..have a vulcan good day!
 
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My guage did not function when I bought the bike..... a few months later I replaced the sending unit which enabled the guage to function. My sending unit had a broken coil wire on the action side, which I figured would not function 100% normally after soldering. Good Luck

'86 VN750 13,700 mi -Stock
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After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
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post #10 of 17 (permalink) Old 05-29-2011, 12:11 AM
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See Page "15-46 Electrical System" of the Kawa Service Manual and it explains how to test your fuel gauge by removing your seat, locating the fuel gauge connector and jumping it with a small gauge wire. Very simple and it will tell you whether your gauge is bad or your float.

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