I have an ongoing issue with the fuel gauge. I have a 2006 F150 5.4 engine. When filling up the tank it will only go to 3/4 full. Cleaned lines, new sending unit, filter, pump, gauge all replaced by the dealer. Problem still exists. Mechanics have no idea what else to do. Any help would be appreciated. Thanks in advance for any help.

Wuffdog

 

Do a search here, I have read others with similar issues. If I remember correctly some have the problem only if they leave the key on when filling. Others had clogs in the breather tube which would prevent the tank from actually getting filled