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Re: Fuel gauge doesn't work
(not the float per say) the sending unit on the pump assembly is very fragile , if you were to look very closely at the button that makes contact to the variable resistor plate while moving the float up and down you might notice that the button can move away from the resistor board and loose contact , thus causing erratic readings at the dash gauge , i have had to remove the float arm and bend the contact arm so as it would have more pressure to the resistor board , or replace the sending unit itself , but when installing the pump Assembly into the tank it can be damaged easily , be careful when installing , its no fun doing it once let alone twice.
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Putting gas has nothing to do with you fuel gauge problem
Must problems to add fuel and comes out can be cause by air flow in the tank, also it is recommended to fuel with the engine turn off so the pressure from fuel pump going back to the tank will not affect the fueling , about you fuel gauge not working properly can be cause by a electrical problem such wiring or defective gauge or can be fuel sender problem with most the time it is install on fuel pump assy.
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)
Either there is a short in the fuel sender wiring or the sender in the tank is bad.The actual gauge is rarely bad.Good luck.
Else The float affixed to your fuel pump in your gas tank is stuck.
It tells the dash you ALWAYS have a full tank. You have to drop the tank, PB Blast/WD40 the float, get it to drop down. Finally Your unit in the tank is bad. Pull it out and move it up and down while someone looks at the gauge. If doesn't work, buy a new one. They are not that expensive.
You just have a ground problem between the frame and tank ground. It has to be connected to a clean tab on the tank at the fuel sending unit. Check and clean them, both tanks. It gets confused and don't know what to do without a complete circuit.
Could be 3 thing - the gauge on the dash, the wiring or the fuel level indicator in the tank. All three are not easily accessible - the best test would be to measure the voltage on the level sensor on the tank.
It usually means removing the fuel tank and start measuring. If its ok, supply voltage to the lead towards the fuel gauge. If the gauge doesn't move it's wiring or the fuel gauge itself.
You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.
On a C900, the fuel sender level unit is separate from the fuel pump
and located on the right side top of the tank, accessible by removing
the trunk floor lift up panel (the pump is located on the left side top
of the tank. Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.
the resistance of the sending unit with the lines disconnected, the resistance should be
2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for
voltage across the top of the sender unit, if no voltage, that's likely
If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.