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Old 04-12-2020, 01:15 PM   #1
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Freaky gas gauge

2005 e450

Ok car folks. Gas gauge at 1/4 tank. Got 30 gallons. Gauge goes below empty with gas light on. On way home it goes back to 1/4 tank. ???
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Old 04-12-2020, 01:21 PM   #2
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The sending unit works by varying resistance (ohms) with fuel level.

First thing I'd do is check and clean the electrical connections, especially the ground, at the sending unit.
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Old 04-12-2020, 05:23 PM   #3
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fuel level technology is still a mystery to engineers. watch hocus pocus to see them in action
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Old 04-12-2020, 10:31 PM   #4
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How many gallons is in that fuel tank?
Could be sender (float) or wire connections all the way and back to ground.
On my older bus ('84) the sender failed because of bio-diesel.
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Old 04-14-2020, 09:56 AM   #5
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Check the sending unit. The gauge/ecm determines the fuel level by the voltage being sensed while passing through a potentiometer in the sender. The voltage will vary based off the specific resistance present in the potentiometer which is determined by the float position. If the potentiometer has an open or short in it, it will give false readings to the gauge/ecm, which can show up as a full tank, or, in your case, an empty tank.
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Old 04-14-2020, 09:58 AM   #6
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Here is a test you can do.



You don't need a second gauge. Simply remove the sender from the tank, plug it back into the vehicle, and then slowly run it through it's sweep. If it gives erratic readings while moving it then you know it's faulty.
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