Ok guys i have a 1990 blazer sport (2 door) got it for $450 was told the sending unit and pump went on it but he found me a used one (yes i will be replacing it all soon) Now i have a friend that will help me put the gas tank up and in but need to know what lines connect to what on the unit

trying to get the truck running to get it in the house before winter to do the lines as they are rusted have pics of the tank and unit and the lines as for the rust on the side came with 2 free rockers

 

Each line should be different sizes. Should just be process of elimination.

 

What blazin said. process of elimination since they are all a different size...

Okay, looking at the photo of the gas tank.... (DONT QUOTE ME ON THIS)
from botton to top on fuel lines....

Bottom in that photo is output (goes to the injector)
second line should be the return.
3rd and 4th should be a breather of some sort...

 

thats pretty cool that those are all hose clamped hoses. everytime i ever dropped a tank on a k5 or any vehicle like this i will just cut the rubber lines as they should be replaced anyways especially on a 20 something year old vehicle. but yeah looking at that pic they are all different sizes, should be easy to figure out

 

thanx guys for the help