Question about 2001 Ford Expedition

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Fuel gauge always full

I was refuling and the guage went all the way to full and stays there even when the tank is not full. my reserve tank also reads full all the time. The truck is a 1997 F-250 Diesel with main and a reserve tank

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  • Check the floater in the tank may be you need to replace it with a new one.

Posted on Jul 25, 2009

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2 Answers

Why does fuel gauge stay above full?


In the mean time you may want to adopt the system I have done with my MY98. I reset the trip odometer at each fill-up. I have always had plenty of reserve in the tank when I refill at 300 miles driven. It is annoying but after 7 years I have learned to live with it. My tank contains 23 gallons and I usually have 6 or more gallons remaining at fill-up.

The expense of dropping the tank and having the repair vs the always check before travel the trip odometer has worked out for me. I have learned this process from boating where the fuel gauges can never be trusted.

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More than likely the sending unit is not communicating with the fuel gauge so even when the tank is full the unit doesn't register it.There could be a short or a loose connection from the sending unit to the guage

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My fuel gauge wouldn't work. The needle stands always on empty position even when the tank is filled full.


its a bit dificult find a good technician and ask him to see the guage inside the fuel tank for fault
i suggest dont try this at home

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Fuel guage was erratic then went past full mechanic installed a new pump and sending unit now it stayed at 1/4 tank and when I filled it itwent below empty. bad sending unit or bad guage or bad mechanic?


Test the gauge by using a test light ,and grounding the test light clip to a good known ground,then touch the pink wire on the connector harness going to the tank,with the connector unplugged,and key on,the gauge will move slowly to the empty mark,and lower ,then remove the test light and it will go past full,if it does this,it is a good gauge,and the sending unit,was put in wrong,or the part was bad.

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if you have pulled the sending unit wire from the sending unit the gage in the dash is bad .

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Hi, this is a sending unit issue. you can try adding some Sea Foam additive to the tank. this may release the sender. if the additive doesn't work, replace the fuel level sending unit.

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2 Answers

Fuel guage stays on full


You've got to check the( Fuel-gauge) sender unit which is inside the tank,
it could be faulty or stuck at 'full' position.
Its mostly fitted on top of the fuel tank could be easily accessable form the inside or you may have to drop the tank.

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