It's not a hard job to do as long as you have the space to work in. I recommend having a heater available if you're in a cold climate, because the hard plastic lines to the sending unit and tank vent don't flex well at all when cold.

Are we talking 4 door Blazer, or 2 door Blazer? The tanks between the two are mounted differently.

If it's a 4-door, it's a saddle-mount and you'll have to drop the tank for sure. I dropped mine without disconnecting the driveshaft, but it was tight quarters. The biggest hassle in the job, I thought, was the hard vent line that goes to the breather/vent at the front of the tank. It's not easy to get to, and can pop off of the vent unsuspectedly while you're maneuvering the tank back into place.

And yes, Delphi is good.....I always forget about them... I tend to think of Delphi and Delco as one and the same, lol

 

It is a 4 door.