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Beleive it or not its more than likely a bad gas cap,pressure in the gas tank is leaking pass the cap,on some cars it makes the check engine light come on
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I believe your problem may be your low coolant sensor(located in the overflow res.), they tend to get gummed up and quit functioning. Also before you chase that, be 100% sure your coolant level is actually full.
The sensor is part of the fuel pump module inside the gas tank. The signal is sent to the body computer, so it could be a faulty module or a problem with the body computer. The circuit would need to be checked with a meter.
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.
Its not my check engine light that stays on, its my low fuel level light. Still a gas cap issue?
Thanks.
gas leaking out of injector
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