sorry guys not to good on here my first time on here any way yes i have gas pushing out of the gas filler tube on my f-150 300-6 front tank I think it might be the check valve assembly is it in the front tank or is it on the rail.any help would be appreciated.

 

This is a common problem with our trucks. Mine was covered under a recall. You didn't state the year of your truck so not sure if yours is covered or not. You can go here to check:

Ford, Lincoln, Mercury and Mazda Recalls

For more info on this issue, select the first post "Read First: 1987 to 1996 Tech info " and scroll down to the "GENERAL MECHANICAL INFO" section. Then select the "on tank filling the other tank " post. You can also do a search for "Dual fuel tanks".

Good luck and welcome to the forum.