Hmmm...I guess you're right. It would be similar to gassing a motorsickle (to say it like my daddy).

 

I used to have a ****-a-sock-ee 400.

 

I had a print out from our Service Engineer when we were trying to figure the problem out. If I remember right there is a line the runs from one side to the other and works as a syphon. We tried modifying the filler neck and adjusting some other parts but found that with a high volume of fuel going in the syphon line was not able to keep up with the flow coming in. When running the pump and sender keeps the tank even. Thats why we never got the problem to happen when the pump was on the slowest speed. There really is no fix now unless you have an 05 without the updated tank. Otherwise I would tell customers to use the slow fill and come back if it still happens. Haven't had anyone back yet.
This article supersedes TSB 06-3-13 to update the vehicle model years.
ISSUE:[/u]
Some 2005-2007 Mustang vehicles may experience premature automatic shut off of the fuel fill nozzle. Several variables, including variations in fuel pump nozzles, fuel flow rates, and fuel flow pressure may result in the premature automatic shut off of the fuel fill nozzle making it more difficult to fill the fuel tank.
The automatic shut off in the fuel fill nozzle may trigger multiple times after delivering several gallons of fuel or it may trigger repeatedly when attempting to establish fuel flow into the fuel tank. The latter concern may be more common when adding fuel to a vehicle where the fuel level is at or above 1/2 full.
ACTION:[/u]
Refer to Service Procedure.
SERVICE PROCEDURE[/b][/u]

On 2005 Mustangs vehicles built before 4/26/2005 that experience premature automatic shut-off of the fuel fill nozzle more than occasionally may benefit from replacing the fuel tank with a revised design tank per TSB 05-15-12. The revised design fuel tank may reduce the occurrence of premature automatic shut off.
On 2005 Mustang vehicles built on or after 4/26/2005 and 2006-2007 model year vehicles were built with the revised design fuel tank. As a result, replacing the fuel tank on these vehicles will not change the occurrence of automatic fuel fill shut off.
Occurrences of premature shut-off may be resolved or improved by using a different filling station fuel pump. Unauthorized modifications and/or alterations to the vehicle are not reimbursable under warranty and are not recommended for this issue.

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This would happen to me from time to time. When at the dealer for an oil change I asked about it and they told me to fill the talk a little slower. I started doing that and it never happened again.

 

I had the same problem... I took it to the dealer and the guy said Ford fixedtheproblem on2007+ models, but they replaced or fixed mytank anyway and I haven't had a problem again.

 

I have an 07 and the problem was not fixed on mine. [:@]

 

I use the slow method, but it really depends on the pump. Some I have to fight it all the way through the fill up, and on others, once I get the flow going, I can go full speed. Sounds like prostrate trouble.