Im swapping out my gas tank due to my current one has about 10 holes in it. I pulled the gas tank out last week and I now in the process of putting my new one back in but I cant remember how the fuel lines hook up. My car was originally an LG4 and now has a carbed 350 in it. There are 3 fuel lines that hook up to the sending unit: feed, return, and vacuum canister. Im assuming the smallest fuel line is the return line but the other two look to be the same size. So I not sure which line hooks to which. Any help would be greatly appreciated. Thanks.

 

Do you have the tank back in already?

My '82 pick-up has 4 lines coming off of it.

Looking from the top of the sending unit with the lines coming toward you and to the right, which is also front to back as they come down the side of the tank:
Left/front (next to the fuel level wire connection) - fuel supply 3/8"
2nd from left/front - return 5/16"
3rd from left/front - vapor canister 1/4"
Far right/back - pressure relief valve 3/8"

 

Thanks a lot. I got it right now. And yes mine does have 4 lines coming off the pickup.

 

Just curious, an '87 should have the in-tank electric pump. Did your new one as well?

 

Yea it did and I went ahead and replaced the pump as well.

 

Good plan.