Question about 2006 Harley Davidson FLHX Street Glide

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I have a 07 flhx and the fuel gauge reads full all time

The gauge reads full even when it is empty

Posted by Anonymous on

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  • Harley Davidson Master
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When the ignition switch is ON the fuel gauge is connected to 12 VDC, current flows through the gauge and the variable resistor in the fuel gauge sending unit to ground. The sending unit float controls the amount of resistance in the variable resistor. Malfunctioning fuel gauges may be the result of a fuel gauge sender or a fuel gauge not being properly grounded OR there may be a defect in the fuel gauge sender or in the fuel gauge itself OR there may be an open circuit caused by a loose or disconnected connection or a broken wire between the ignition switch to the fuel gauge.



A suspect fuel gauge system can be tested by FIRST removing the gauge and grounding the Y/W wire of the fuel gauge sender located at the bottom of the gauge, turning the ignition switch ON at which point the fuel gauge must indicate FULL. And if it does so then the fuel gauge is functioning correctly.And if it does not read FULL then get a multimeter set to the RX1 scale and measure the resistance of the sending unit by placing one of the meter probes on the Y/W wire and the other probe on a good ground. THEN for FLHT/C/U, FLTR if thefuel tank is full the meter reading should be 7-14 ohms and if the tank is empty the meter resistance reading should be 74-95 ohms resistance and a half full tank meter resistance reading will be approximately 30-38 ohms. For FLHR/C/S if the fuel tank isfull, the meter resistance reading should be 27-40 ohms, if the tank is empty 240-264 ohms and if half full approximately 97-118 ohms. FOR ALL MODELS if there is a very highmeter resistance or infinity reading the sender may be "open" or not grounded. In this case check to see if the sender and fuel tank are grounded by placing one of the ohmmeter probes on the flange of the sender and the other probe on crankcase and if the ground is good the meter must indicate one ohm or less and if the reading is one ohm or less the sender is defective and requires replacement and if a higher resistance reading is obtained you will need to check for a poor ground wire. THENyou can check the voltage to the O/W (+) wire and the BK (-) wire of the fuel gauge connector if the gauge did not indicate FULL and the correct reading will depend on the source voltage and the level of fuel in the tank or the position of the sender float arm on the variable resistor etc. If there is NO battery voltage present there may be a broken, highly corroded or disconnected power wire. If you cannot find a problem using the above testingreplace the gauge itself.

Posted on Oct 14, 2014

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Posted on Jan 02, 2017

  • 29 Answers

SOURCE: Fuel Gauge reads empty all the time

The circuit for a fuel gauge is: battery positive through the gauge resistor to the sending unit to the fuel tank(sheet metal) to the chassis to the battery negative. If you didn't remove the sending unit the most likely problem is the fuel tank is not grounded to the frame. Scrape some paint at the rear mounting bolt where you can't see it and re-tighten the bolt. If you removed the sending unit, check the cork gasket. There should be a staple in it that is the connection to the sheet metal. No kidding.

Posted on Dec 31, 2008

  • 420 Answers

SOURCE: 1999 ultra classic fuel gauge reads full all the

Why worry about the fuel gauge? Most are inaccurate any way, just to it the old fashion way with the trip odimitor.

Posted on Apr 14, 2009

  • 13 Answers

SOURCE: Fuel gauge issues

sounds like a bad ground or one of your wire was tightened down on the wire. you may want to remove it again to see if it was plugged up right. while loosening your bolts, check to see if it begins working

Posted on Oct 09, 2009

  • 18 Answers

SOURCE: harley davidson flhx - fuel gauge not working, low

bad sending unit for fuel gauge in tank

Posted on May 09, 2010

wd4ity
  • 4565 Answers

SOURCE: gauge will power up. .. stays on full, turn power

If you'll contact me directly, I'll send you some information on the fuel gauge. The info is or a 1994 FXDWG but the gauge works the same way on all Harley bikes. They may be laid out a bit different but the principle is the same. Contact me at wd4ity@bellsouth.net and I'll send you the information. This forum only allows files no bigger than 150Kb and they're bigger than that. Don't forget to remind me of what you want, I get lots of request for info.

Steve

Posted on Mar 09, 2011

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1 Answer

How to adjust gas gauge to read right not reading way over filled like it does now. When 1997 chev 350 vortec truck gauge is at 1 st red mark close to empty, better not past gas station ! ! !


the fuel level sender is inside the fuel tank, part of the fuel pump assembly. did you or was the tank replaced before??they may have bent the float arm on reassembly . you can buy the sender from your parts supply store .you will have to drop the tank to do this it clips onto the side of the pump assembly. run it almost dry first as the tank is big n very heavy even 1/4 full. you can try to bend the old arm

but its very hard on the "sender" as for level indicator full to empty, think of the shape of the tank narrow at top to widest point in the middle (full to half) wide middle to narrow bottom( half to empty)

its just an overall volume thing

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1 Answer

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Ground the yellow wire to see if the gauge goes to full, if not check all connections , if you can't find anything wrong with connections make sure you are getting voltage if all is good replace gauge.

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Was the fuel sending unit replaced also?

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06 FLHX I Street Glide Fuel Gauge issue.\r\nI guess I've been one of the lucky guys whose fuel gauge worked really well & quite accurate since I bought the bike in 06. Now it has been reading...


Contact me directly and I'll send you some information on the principle of operation and troubleshooting the gauge. It's out of an older manual but the principle is the same and I think the readings are the same. The float is on the sending unit and usually if the float goes bad, it sinks and the gauge should read empty all the time. But, since the original did the same thing, it shouldn't be that the arm got bent either. wd4ity@bellsouth.net Make sure you remind me of what you need.

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It could be a bad fuel gauge in the dash unit, but....
Usually it's "The bad".
The fuel level sending wipe arm and windings on the fuel sender wear and send erratic readings.The only cure is a replacement fuel gauge sender.
The check engine light should not be related to the erratic fuel readings.
"The good".
If you have over 200,000kms or 120,000 miles on your van you need a new fuel pump anyway,so have a complete assembly put in which will have a new fuel sender on it.

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My 2000 Chevy Impala fuel gauge reads empty.


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1993 Jeep Grand Cherokee gas gauge reads empty but tank is full.


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Fuel gauge not working all the time.


This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
Recovery
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

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1 Answer

Fuel gauge reads full all the time


your ground wire from your fuel tank to the chassis has come disconnected

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