If it had the 258 i'm pretty certain it had a return line.
If it is anything like the CJ, you should have 3 lines going down the left frame rail:
-Vent line (from the tank/ rollover valve, this goes to the charcoal canister)
On the right frame rail, there should only be one line, the fuel feed line, going up to the stock fuel pump.
If this is the case, you will have a small problem:
Since the feed line should be on the *left* frame rail, and the return on the right, you will have to change the stock return line on the *left* frame rail, to a larger diameter
(and use it as the feed line).
I reused the stock feed line (on the right frame rail) as the return line.
Also, you should use new rubber hoses from the end of the hard-lines, to the tank.
If it is like the CJ, you will have to lower the tank, because the feed/return lines are connected to the top of the tank, and it is impossible to get to them, without lowering the tank.....
I just spliced the old rubber lines, praying that they will hold up for another month or two, then i'm going to lower the tank, changing the rear crossmember etc....
It could be that you will be somewhat confused *if* the YJ has the roll over valve etc.
There are two small plastic "boxes", one about 1/2 a coke can, mounted in the rear of the left rear wheel wheelhouse.
There will be some rubber hoses going up/down -- to/from the tank to these two. From one of them, there will be a hose going to a line, which ends up in the charcoal canister, mounted low on the left front fender.
It has 4 (??) hoses connected to it.
There is a web page explaining all this, search the tech stuff or search for "jeep 258 charcoal canister" or something like that .....
PerJ (From Norway)
Using self-discipline, see http://www.eiffel.com/discipline