re: "no fuel pump fail yet on 2005 tl. is there a probable time frame for these to go out? or mileage? or model year?"
Our home-town mechanic tells me this is a not-unexpected misery of his clientele with a certain age-model group using this particular pump/filter/tank design.
Whether odd-ball design or plastic incompatible with ethanol he hasn't determined. Mine looked like it was rotting from the inside out.
He also notes GM retains the various design/mfg rights and holds closely the rights/sales/etc.
re: " they had to drop the driveshaft, then the tank.
"....this wasn't necessary on mine....only the tank came out.
Our 213 is 2005/barely 33000 miles on it.
Buddies similar problem on a 1/2 ton 2003 GMC van, with considerably more miles on it. And several of THEIR friends with similar rigs.