Grand CHerokee Fuel Pump(s)

[blauto]

WE are having a great deal of difficulty with an 04 Grand CHerokee V6.
the vehicle was stalling out. We found a wire broken and replaced it March, 2010. Then IN august, 2010 same symptom. we diagnosed a faulty fuel pump
and replaced it. Problem We were no longer a Chrysler dealer. Neighboring dealer replaced the part under original factory warranty.

In 11/2010 same problem. Chrysler dealer covered it under parts warranty but Customer ate the labor. We provide loaner.

5/2011 again same problem. We put another pump on and off he went. Again covered under CHrysler parts warranty.

Customer drove home and same problem. We drove it in the morning and it ran great for 10 miles then stopped. It would not start. You can get it to start by banging the gas tank just like you would for a faulty fuel pump.

Can it be possible that 4 fuel pumps were bad. Has any body else had this problem? Any suggestions?

How do you guys handle the customer when you have to send it back to a factory dealer that will take 2 weeks to get it in the shop?