CowboyRon, I certainly hope your truck is gasoline? If its diesel, you've got issues putting 4 pumps on it, haha. It has no transfer pump unless aftermarket, only a very expensive high pressure pump.
So assuming its gasoline, yes gm truck fuel pumps are notoriously bad. Check the ground, its under a bolt on top of the frame right by the tank, near where the filler neck goes over it. It must be very clean. And what brand are you using on the pumps? Over the years I've probably had the least problems with Delphi pumps, although I think they are probably the most expensive. (I hope you don't say your using Delphi pumps). Hope this may help you avoid pulling the tank so much in the future.
And to the gentleman a few pages back that said he prefers the dealership:
I'm certainly glad you've found a mechanic that works for you! You must have better dealerships in your area. I've never heard anyone utter those words. Around here, and any other place I've been, it is the complete opposite. The dealer is always the last place you want to go. They usually want to oversell services, add on extra parts, and lots of times don't fix the problem you brought it in for. In my area, they are my best friend. I get disgruntled customers from them all the time! I hope they don't do the same to you. Perhaps its a regional thing and its just local to my area
Man, you guys with the rust.... thats depressing. I'm never moving! I couldn't deal with that. I hate getting cars in with rust problems. And I rarely see them, only every few months or so, someone traveling through
