The tsb does not work. All they do is put in a newer crossover tube that is supposed to equalize the pressure. Some have had luck, but most do not.
Here is the TSB for it.
FUEL FILL SLOW, OR DIFFICULT TO FILL TSB 05-4-8
FORD:
2005 Mustang
ISSUE OPERATION DESCRIPTION TIME
Some 2005 Mustang vehicles may exhibit the fuel 050408A 2005 Mustang 4.0L SOHC: 1.7 Hrs.
tank being slow or difficult to fill. The condition may Replace Fuel Tank
be described as, repeated rapid shutoffs of the (Includes Time To Drain,
filling station pump nozzle, or multiple nozzle Refill And Transfer Any
shutoffs when attempting to fill the fuel tank. The Necessary Parts) (Do Not
condition may be due to the fuel tank vapor venting Use With 9002A, 9275A,
system inside the fuel tank. 9350E)
050408B 2005 Mustang 4.6L 3V: 1.9 Hrs.
ACTION Replace Fuel Tank
Install a new fuel tank. The new fuel tank has a (Includes Time To Drain,
revised internal venting system to improve fuel Refill And Transfer Any
filling. Remove the fuel tank assembly per Section Necessary Parts) (Do Not
310-01 of the Workshop Manual. Use With 9002A, 9275A,
9350E)
PART NUMBER PART NAME DEALER CODING
CONDITION 5R3Z-9002-AA Fuel Tank
BASIC PART NO. CODE
9002 42 WARRANTY STATUS: Eligible Under Provisions Of
New Vehicle Limited
Warranty Coverage And
Emissions Warranty
Coverage