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It doesnt register the gas level either its always full or empty.

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This sounds like a fuel gage sensor. most vehichles have these inside the gas tank.

Posted on Apr 03, 2011

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There is a float in your gas tank, it is probably broken. This is the part that reads the level of gas in your tank. Probably an expensive fix.

Posted on Apr 03, 2011

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Gas gauge light on shows empty, but is full


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Gas Gage is unstable. One moment it registered that the tank is completely full and then moments later it shows it is completely empty and then it jumps up to being mid level. Is there a problem with the...


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1989 Saab 900 low level fuel light


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.

Test 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 the problem!

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.

Good luck!

Saabreur

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