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Drop the gas tank and check for contamination/corrosion. You're going to have to do that to replace the fuel level sender anyway and check both the fuel pump (it's in the tank) and the primary filter on the pickup tube.
Sounds like it's the fuel level sensor in the tank that measures that for the dashboard. It's either that or it's a different issue. Could even be a fuse or relay that's bad. Check your fuses first, just in case.
Digital gauge also gets its input for fuel level from a float in the tank. Here the culprit can be that float because the error is systematic i.e., full on empty and empty on full/half. If the reading was erratic then it was something to do with IC in the bars display panel.
Tank is full. The level swith is bad. Have to pull the bed to get to the fuel pump. Pump and fload is all in one. If you work on this yourself, replace the whole unit with Ford parts, do not use after market it will not last. If under warranty just go to dealer. Good luck..
Normal. There is a resister in the fuel level circuit that slows down fuel level readings. A gauge that responded instantly to a sloshing fuel level every time you went over a bump or around a turn would drive you crazy.
The fuel gauge sensor on my 2008 1200GS Adventure was defective and needed replacement. On my first ride after buying it new from the dealer it showed full (all bars), but ran out of gas on my first ride. No further problems, and it is now 40,000 miles.
Hope this helps.
Mine too! I have a 2007 Chevy Malibu also and I knoticed it does that or bounces up and down once my tank gets to half full. Have you found a solution? Sometimes my check engine light comes on and sometimes it doesn't.
I haven't worked on an '09 model but all the Softails I ever worked on had two tanks. To remove them, first remove the dash and any thing covering the "tank gap". There are three bolts on each tank half, two in the front of the tank and one at the rear. There is also two hoses that connect the two tanks to each other. One in front that is the fuel crossover. Make sure you drain as much fuel out of the tanks as possible before removing this line. Still there will be some gasoline spill out so don't be smoking while doing this job. The other hose is a vent hose at the top of the tanks under the dash. It just vents the left tank to the right one since the left tank gas cap does not have a vent built into it. If it did, gasoline would spill out when the tanks were full and you put the bike on the side stand. You may not have to remove both tanks to install your bars. I don't know where the handle bar wiring harness connects under the tanks.
Well that tells me that someone installed the wrong fuel level sensor. Your going to have to drop the tank and pull the pump and float assymbly out. Then go to a parts store and get a sending unit that has the opposite resistance of that sending unit. Just wait until the tank is empty so its a lot lighter. You can call the parts store or go down and see if there is multiple sending units. The sending units work by resistance, when the tank is full the float moves up and turns a wheel in the sending unit, which either removes or increases the resistance causing the gauge to lower. The sending units either give full resistance at full or no resistance at full and then changes as the level goes down until it does the opposite at empty.
I had the exact same problem. It ended up being the float inside the tank. The float was around $90 but 2-3 weeks later I ended up replacing the whole fuel unit which came with a new float attached. I should have just replaced the whole unit when I replaced the float. If you still have the original fuel unit, you might want to consider just replacing the whole unit. I hope you find this helpfull.