I did a quick search and came up with this. Not sure if it pertains to you or not Lee, but maybe point you in the right direction.
ISSUE
Some 2005 Mustang
vehicles may exhibit the fuel tank being difficult or slow to fill. The condition may be described as repeated rapid shutoffs of the filling station pump nozzle or multiple nozzle shut offs while attempting to fill the fuel tank. The condition may be due to the fuel tank vapor venting system inside the fuel tank.
ACTION
The
dealership is to install a new fuel tank. The new fuel tank has a revised internal venting system to improve fuel filling remove the fuel tank assembly per section 310-01 of the workshop manual.
PART NUMBER
5R3A-9002-AA
WARRANTY STATUS
Eligible under provisions of
new vehicle limited warranty coverage and emissions warranty covereage.
TIME
3.6 Flagged Hours To Fix Under Warranty