Fuel metering float in my 1200 fuel tank is not reading correctly anymore - Steve Saunders Goldwing Forums

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post #1 of 10 (permalink) Old 09-20-2019, 07:27 AM Thread Starter
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Fuel metering float in my 1200 fuel tank is not reading correctly anymore

Has anyone come up with a solution when the the float no longer reads correctly. It will only read 3/4 when the tank is full and reads 1/4 tank after shutting off the bike after fill ups . Have not pulled it out of the tank yet . Did see if I could source the part but unfortunately no one has it anymore. I can contact a friend with a parts bike but I’ll probably be buying the same issue eventually. Can the float be the problem? Filling with fuel. Any help is appreciated?
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post #2 of 10 (permalink) Old 09-20-2019, 08:31 AM
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If your other gauges seem to be off you might check the instrument voltage regulator. (IVR 7 Volt) If only the gas gauge you probably have a dirty or bad sender. The third possibility would be a bad connection in the gas gauge circuit. At the sender you should find 2 wires.. The green needs to be a good clean ground. The yellow/white needs to have a nice clean connection also. If you short the yellow/white to ground briefly with the key on the gauge should swing all the way in one direction. When you disconnect the yellow/white the gauge should go all the way the other way. Those 3 are most likely but it might be an issue with the gauge itself.

Mike

Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.
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post #3 of 10 (permalink) Old 09-20-2019, 09:55 AM Thread Starter
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Thank you Sir ! I’ll definitely check those points you mentioned. I’ve contacted the parts bike friend and he does have a sending unit just in case .
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post #4 of 10 (permalink) Old 09-20-2019, 10:44 AM
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As you say it's reading 1/4 full with the key off the problem is probably in the gauge in the dash not the sender in the tank.
BTW your Interstate doesn't have a 7volt regulator.

Advise given here is free and comes with no warranty "Caveat emptor"

Ken.
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post #5 of 10 (permalink) Old 09-20-2019, 12:24 PM
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Corrosion in the sending unit...?
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Why ain't we ridin'?
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post #6 of 10 (permalink) Old 09-20-2019, 01:57 PM
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Garage
as one last thought, you can drain the tank of gasoline,
put in a mix of baking soda and water,
and use electrolysis to clean the sender w/o having to take anything apart.

lots of threads on electrolysis


https://www.goldwingfacts.com/forums...ctrolysis.html

https://www.goldwingfacts.com/forums...rks-great.html


This link contains a detailed "How to" list of instructions

http://www.rickswoodshopcreations.co...st_Removal.htm

Where he mentions using a plastic bucket, that is just for cleaning up rusty tools, etc.

for us, the container is the gas tank, just hang a metal chunk in the solution and good to go.
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post #7 of 10 (permalink) Old 09-20-2019, 02:20 PM
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Quote:
Originally Posted by Ken Bergen View Post
As you say it's reading 1/4 full with the key off the problem is probably in the gauge in the dash not the sender in the tank.
BTW your Interstate doesn't have a 7volt regulator.
Ken,
Doesn't the bike still have the voltage regulator but it is just integrated in the circuit board? It iis not stand alone?

Mike

Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.
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post #8 of 10 (permalink) Old 09-20-2019, 05:39 PM
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This is just a thought. I have a 84 1200 that was doing the same thing about 3months ago. My fuel gauge would read 3/4 but wouldn't go any lower. This was a problem because I couldn't tell when I was out of gas till it ran out and I would switch to reserve. I ran a few tanks of seafoam thru my gas tank and presto!!!! My gauge works perfectly now. Maybe the float was getting stuck and the seafoam freed it up. This may or may not be the case for you too. Hope you get it figured out.
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post #9 of 10 (permalink) Old 09-21-2019, 05:26 AM Thread Starter
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The gauge was working properly at the beginning of the riding season. But when I fill the tank it only shows 3/4 . When I shut the bike off the gauge does go to left like normal but when I turn the key on again it will then show between 1/4 and 1/2 . Then as I ride it it seems to rise some ? So I’m not sure what the problem is ? I’ll replace the sending unit first and go from there.
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post #10 of 10 (permalink) Old 09-28-2019, 07:55 AM Thread Starter
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So I tried a different float out of a 85 I’m parting out and still no joy . Everything else on my dash is working correctly so I’m ruling out the IVR 7volt in the dash for now . Maybe the parts float is junk too ? Next step is grounding the yellow/white wire. Also there is three wires to the float not two .
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