i have a 94' flareside with the rear tank. and when filling up with gas it takes about a half hour to fill it cuz it wont take it fast. had anyone had this problem and know how to fix it. i would like to get if fixed as soon as possible.

 

Sounds like the filler tube is kinked or partially plugged with something. If you poke your head under the fender it's right there to see, you'll have to drop the tank to change it though.