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I have a '67 Cougar with a 17 gallon fuel tank. Every time I go to fill it up (I usually fill it up when it is a little less than 1/4 tank left) it only takes 8 gallons. Is this due to a faulty fuel gage or faulty fuel sending unit?
 

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I would first pull the wire off the sending unit and ground it, with the ign. on and see if gauge goes to full, if it does, then I would think sending unit is bad.
 
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