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Discussion Starter · #1 ·
I've got a 71 nova (unfortunately) with the 250, just trying to get it on the road before the end of summer. So far I've ordered a "front to rear fuel line kit", a new gas tank, and fuel sending unit along with the fuel hoses and all to link up to the lines, but in the catalog I saw "Vapor return lines" what are these, where do they go, and do I need 'em?
Thanks yall!
John
 

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Evaporative emission controls included a sealed gas tank (plastic threaded gas cap instead of the old two prong vented gas cap), and an activated carbon canister under the hood by the radiator which filtered all of the gas vapors from the carb and the gas tank. That Vapor Return Line is the vent that allows you to suck gas out of the tank (by letting filtered air in). Be thankful it doesn't have EFI it has three lines to the tank (3rd is the return line for the electric fuel pump).

I didn't think they used a vapor line in '71. I thought it was more of a mid eighties thing, but I could be mistaken.

Big Dave
 

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Discussion Starter · #3 ·
I do have three lines coming from the OEM gas tank, one of which being the 5/16 because of the straight six and the other's being 3/8's or 5/8's, is one of these what you meant? My order should be in in like 3 days so, if I dont have everything I need in the kit, its safe to say that the vapor return line is what's missing?
 

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my 70 nova was an orginal 307 california car that had to nipples on the drivers side ( which went to a canister under the drivers side fender and evap canister) that was welded onto the gas tank and it had 5/16 supply and return on the sending unit it self..i cutoff and welded those emission lines and ordered a 3/8 sending unit and line..

basically it depends on what your new tank requires
 
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