Dont know anything about Mustangs, but most fuel tanks have a narrow
breather tube that comes from the top of the tank to the filler neck, this
narrow tube lets air out as fuel goes in. Find it, check it isnt snagged or
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.