I wrote this in the non specific area because I know the 4.3 and that fuel pump works on alota diff vehicles....
Just replaced my fuel pump in my '00 S10 ZR2...
There are 3 gas lines running into the pump
Anyone know which one goes where?? And what is the box behind the fuel tank that one of the lines runs to??
Thanks for any help!!

One line is fuel delivery. The other is return and the 3rd is tank vent. The "box" is the vapor cannister. The lines are all different sizes so they can only go on the tank fittings one way.

Ok awesome, thank you! I havent had time to go work on her yet...just swapped the radiator in my alltrac...grrr 2 many cars 2 lil time!

Ok I put new connection clips on the hoses and they are all on and seem to be ok, next problem though...when I turn the truck to ingnition, I dont hear the pump running, when I shut the ign off, it sounds like its running!!??! Im going to take the multimeter with me next time and see whats going on but got any ideas??