Question about Harley Davidson FLHTCUI Electra Glide Ultra Classic Motorcycles

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My fuel gauge indicator stays over on the full mark even if the tank is half full. i have checked the float in the tank, it does not appear to be hung up.could it be the gauge itself?

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You problem could be the gauge or the float. Simply because the float moves does not mean it's sending the correct signal to the gauge. If you will contact me directly as wd4ity@bellsouth.net, I will send you information on how the gauge works and how to check it. Since you didn't mention what year and model bike, my information is probably for an earlier model but the principle of operation is still the same. I think it will help you determine what and where the problem is.

Good Luck
Steve

Posted on May 22, 2011

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Posted on Jan 02, 2017

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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

Why does the fuel light stay on


WHAT DTC\'s are set???



It sounds like a short to ground on the gauge circuit but see below for further and better diagnosis:



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 is full, 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 high meter 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. THEN you 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 testing replace the gauge itself.

May 29, 2014 | 2005 Harley Davidson FLHTCUI Electra Glide...

1 Answer

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


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.

May 10, 2014 | 2006 Harley Davidson FLHX Street Glide

1 Answer

Fuel gauge not working


the fuel gauge sender is a float in the tank running against a coil of wire if the float has filled with fuel it wont float,first to check two wires connected to sender,pull off and touch together that sould read full on gaugeif not its the gauge at fault,if its ok youll need to get sender from tank its normall held with a big nut half turn to release,check for corrosion breaks or damage good luck

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1 Answer

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1 Answer

My kia sportage fuel gauge never goes to the full mark after i full the tank all the way up,it only reads just after the half mark. what gives?


Fuel gauge float in the FUEL tank seems to be misaligned or already damage! Bring it to ur nearest garage mechanic to take a look at it! Taaah!

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3 Answers

Gas guage no longer works when below half a tank.


You are probably looking at dropping the fuel tank down and removing the float and sending unit ( all in one unit). Once it's taken apart, you may see that you can fix it or you may have to replace it.

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1 Answer

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Sounds as though the tank sensor is faulty. Access through top of petrol tank, note the wiring colours and position. Lift out and check condition of float and the rheostat wiring and slider. Get a replacement from EB spares

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