Recently on my 2004 TB EXT(121,000mi.). Upon warming up car in driveway entered car had gasoline smell in cabin. There was also a strong odor in the front passenger area of the engine. This is opposite of where the FPS is mounted on the engine a bit weird but i guess understandable.
It is important to not that the fuel guage acted erratically when driving in this condition so this may be another sign to help narrow down the possibilities. This should not be confused with the instrument cluster problem which we have repaired with the kit that can be found on the this great forum.
Took car to mechanic $253.00 parts and labor. This is a bit much in my opinion but he has a business to run. However 1.2 hrs of labor charged is probabaly book for GM. $120.00 part cost obviously marked up. I was more concerned with a coil problem or a clogged fuel injector, thus raw fuel going into cat. I am happy that the repair was not excessive and wanted to inform others that this repair appears to be simple and can be done by anyone in 30mins or less. Good luck hope this saves you money wanted to give back all the good I have received from this forum. We puchased this truck new and have given it TLC with Mobil 1 oil changes at the begining still going strong.