I have a 89 Bronco with the 5L motor and fuel injection. I got the truck about two months ago and filled it with gas and drove it back home from western Montana and had no problems with refueling it along the way. But after a couple of weeks went by and I tried to put fuel in, it keeps belching back.If I fill it real slow, it takes it till the fill neck is full. What's up?

 

sounds like a kink in the fill tube or the air breather tube inside it