Question about 1986 Ford F 250

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1986 f-250 duel tanks fuel gauges not registering right

When i fill the side tank gauge will read full untill i drive then will drop to empty right away,back tank will read full and will drop to empty after a few days. can you tell me what the problem mite be.thanks

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Id say either your sender unit is nackered or you have a bad earth to the body

Posted on Feb 05, 2009

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Posted on Jan 02, 2017

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My 2010 Mazda 3 is showing full tank of gas when it's actually almost empty therefore it will not accept more gas.


If you cannot fill the tank because of an erroneous reading then it is time to replace the gas gauge sending unit responsible for the anomaly. Hope fully you can do it from the trunk - otherwise you will have to drop the gas tank to gain access.

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the fuel level sender is inside the fuel tank, part of the fuel pump assembly. did you or was the tank replaced before??they may have bent the float arm on reassembly . you can buy the sender from your parts supply store .you will have to drop the tank to do this it clips onto the side of the pump assembly. run it almost dry first as the tank is big n very heavy even 1/4 full. you can try to bend the old arm

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its just an overall volume thing

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Repair is a major job involving dropping the fuel tank, a messy and dirty and dangerous job. It will take you at least one full Saturday to do this job if everything goes right and you have the proper parts. My free advice to you is to fill your tank every 200 miles and forget about the fuel gauge.

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I have a 2004 pontiac montana. for about two years the fuel guage would fold over and read 125 degrees when the tank is full. it woulld stay there until tank was empty and the needle would drop to empty,...


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"The good".
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sending unit in tank needs to be replced, drop down tank and replce

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