83 fuel tank leak question

[rigid]

like always i wait until the last minute .. put the blade on because we have snow coming . filled with fuel . truck sat all summer and now have a leak . I have a plastic tank on a bare frame that I can get to easily . It only has two lines off the top . I would guess supply and return ? The one on the truck now has three lines . Can I make the plastic tank work ? Have a couple drives to blade and not sure if it will run off the passenger tank .
Thank you