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Gas Gauge never reads full

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Akkis

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Apr 22, 2015
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Hi, all.

I just purchased the C650GT. Every time I fill my tank I can never get it full. I am always full in the tank but missing that first dash.

My friend who also has a C600 has the same problem.

Is that normal? Not sure what it is. I have even tried manually topping it off and still no dice.

Any advice is appreciated.
 
Got it. I figured it would still be fine filling on the side stand. Everytime I need to fill up on the center? Thats kind of frustrating but no biggie.
 
Akkis said:
Got it. I figured it would still be fine filling on the side stand. Everytime I need to fill up on the center? Thats kind of frustrating but no biggie.
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I do side stand for around town as it's easier then center for trips. Have done a few trip with buddy who has VSTROM and we are fairly well matched as to when we need filled.
 
If I just stick the nozzle in and fuel till it automatically shuts off I was also getting the same effect fueling on the side. However, on the side or center, if I pull it back and *carefully* visually fill the last bit I'm able to add .3 to .4 more gallons. I was surprised at how much more room there was doing it this way. California has a vapor recovery nozzle that is a bit of a pain because I have to pull back the cover to force it to engage but after a few uses it got easier.

gas nozzle.webp
 
Hey everyone, I'm Akkis' friend that he was referring to. This was the first time I've had this gas gauge issue. I'm at 2,000 miles. I've always filled up while on the side stand... Maybe 9/10 times.

I assume I can fix the problem of the missing bar(s) by running my tank empty. I don't plan to run it dry, but just enough to its low point. I'm thinking whatever measures the gas will calibrate or reset itself to read correctly.

Speaking of filling up the tank, is it bad to fill up to the top even after the auto-stop? For my car, yes I auto-stop. I've also been doing it on my Vespa but I've been playing around when it comes to my C600. So, is there a negative effect when fill past auto-stop?
 
The problem is that on the side stand there will be a bit of air trapped on the right side of the filler neck. Upright on the center stand that bubble will be eliminated. It doesn't amount to a lot but it can be enough to keep the gauge from topping out.
 
Also, when you turn the key and BEFORE you start it... let the bike go through it's complete startup routine. It's like starting up a computer and trying to do something before all systems are GO. I found this to give me an accurate gauge reading even on my R1200RT.
 
I squeeze every drop I can get in the tank. I don't call it topping off, I call it filling the tank. When you only have 4.2 gallons you don't leave empty room in the tank. The only time I don't is during winter in very cold weather. Gasoline contracts in the cold. If you fill the tank completely from a cold underground tank an then park the bike in a warm garage you might get some spillage from the gasoline as it warms and expands.
 
Went out for a nice ride with Akkis yesterday and filled up my tank. Gas gauge was 2 bars down after auto-stop. Filled it ALL THE WAY UP and the bars were 100%... Same with Akkis.
 
Disney said:
Went out for a nice ride with Akkis yesterday and filled up my tank. Gas gauge was 2 bars down after auto-stop. Filled it ALL THE WAY UP and the bars were 100%... Same with Akkis.
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P.S. We both filled it up with the bikes on the center stand.
 
It makes no sense to leave the ignition on whenever the bike is stopped for more than a few seconds. That battery isn't all that big and a few minutes with the engine stopped and the lights on could have one looking for a jump start which also isn't all that convenient what with the battery buried behind the right side cover. It's a lot smarter to make sure the key is in the off position whenever you stop the engine.
 
exavid said:
It makes no sense to leave the ignition on whenever the bike is stopped for more than a few seconds. That battery isn't all that big and a few minutes with the engine stopped and the lights on could have one looking for a jump start which also isn't all that convenient what with the battery buried behind the right side cover. It's a lot smarter to make sure the key is in the off position whenever you stop the engine.
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I jump started a big Victory last week at the gas station. He had stopped to fill up, go to the can and then pay - all while ignition still on and it was almost flat and certainly not enough to crank it. My handy dandy emergency portable battery......
 
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