Question about 2008 Harley Davidson FLHRC Road King Classic
GAS GEAGE READS EMTY BUT TANK FULL
Posted by Anonymous on
For a 2008 Touring bike with the ignition switch turned to IGNITION the fuel gauge is connected to +12 volts. 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. Inoperative gauges may be caused by several different circumstances: the sender or fuel gauge may not properly or sufficiently grounded; there may be a malfunction in the sender or in the fuel gauge; there may be a broken or disconnected wire from the ignition switch to the fuel gauge; there may be corroded connections at the fuel gauge.
Test the fuel gauge system by FIRST removing the gauge, THEN ground the fuel gauge sender Y/W wire located at the bottom of the gauge, turn the ignition switch to IGNITION and the fuel gauge must indicate FULL in which case it is functioning correctly in which case set a multimeter to the RXI scale and measure the resistance of the sending unit by placing one probe on (Y/W) and the other probe on the motorcycle ground or bare chassis point as a ground. If the fuel tank is full the reading should be 30-50 ohms while an empty tank should have a 240-260 ohm resistance value and a half full tank will be approximately 125-165 ohms. If a very high resistance or infinity is indicated on the meter, the sender may be "open" or not grounded. Check that the sender and the fuel tank are both grounded by placing one probe of a Multi-Meter on the sender flange and the other probe on the engine crankcase. The meter then must indicate one ohm or less. Replace the sender if one ohm or less was present and if a higher resistance is present, check for a poor connection on the ground wire.
If when the gauge did not indicate FULL when the fuel gauge sender Y/W wire was grounded with the ignition switch at IGNITION check the voltage to the (O/W) (+) and (BK) (-) wires of the fuel gauge connector and a correct reading will be equivalent to battery voltage. If battery voltage is not present check for a broken or disconnected wire. Replace gauge if wiring problem is not foun
Posted on Oct 18, 2014
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Posted on Jan 02, 2017
It most probably just needs a good ride to clean the cob-webs out. But, check your battery terminals to make sure they are clean, make sure your battery is fully charged. Then take it for a series of short runs so that if it ***** itself, you are not far from home. If it now starts to show signs of improvement, then get it out onto a freeway where you can idle along a 110 kph and it should come good. If there is no improvement, then get an auto-electrician or a bike mechanic to run a multi-meter over it to make sure that the electics are OK. Only then start looking at the carbys, it is rarely their problem.
Posted on Jan 26, 2010
If you will contact me directly, I'll send you some information about the fuel gauge and how it works. I cannot do it here as this forum only allows for picture files of 150 Kb in size. Contact me at email@example.com and remind me of what you need.
Posted on Oct 01, 2010
I have a 2008 Road King Classic (and have had the tank off), so maybe they're similar.
Disconnect the negative lead of the battery.
My dash has a screw under the nose of the seat (which must be removed) and one in the front.
lift dash and unplug harness.
If you have a gas gauge in the left hand gas cap, underneath tank unplug it's connector.
The fuel line has a quick disconnect. Pull fitting, and line unplugs.
There is a check valve inside to keep gas from leaking, but it's a good idea to have a catch cup, just in case some residual fuel flows out.
From there, I have a bolt on each side of the front of the tank, one in the center rear, then lift it off.
Posted on Mar 24, 2013
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