Fuel tank problem
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Posting Guru
Joined: Jul 2011
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From: Elk City, OK
Fuel tank problem
I am having problems with my 1988 F350's fuel tanks. I was told by the PO that the front tank doesn't work and is full of old nasty fuel. He doesn't know what's wrong, he just knows it doesn't work. I plan to drop it and replace the old tank, but how do I troubleshoot it? Is there a way to test the switch and sending unit?
The rear tank is fine functionally, but the gauge either occasionally works or always reads full. Is this a grounding issue?
The rear tank is fine functionally, but the gauge either occasionally works or always reads full. Is this a grounding issue?
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
On an 88 it would be a short to ground to make the fuel gauge go to full.
An open or lack of ground would make the fuel gauge read empty.
You may also have the wrong year sender in the tank.
You need to replace the tank, sender and pump (one item), fuel filter and maybe clean the selector valve.
An open or lack of ground would make the fuel gauge read empty.
You may also have the wrong year sender in the tank.
You need to replace the tank, sender and pump (one item), fuel filter and maybe clean the selector valve.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Sure it is located on the LH (drivers side) radiator support.
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