fuel line identification question

[jeepboy45]

Many years ago I did away with the charcoal canister, check valve, etc.

In my engine compartment, there are 3 "fuel lines":

1. Fuel supply line
2. Fuel return line (smaller diameter)
3. Line that was meant for canister, vent,....something

Without actually dropping the tank to see which of the two larger ones is the supply line, is there any way to tell which of the two lines is the supply line?

Yes, I know if I hook one up to the pump and no fuel comes out, its NOT that one.... I dont want to figure it out that way if possible.

Once I determine the "extra" line, what is the "proper" way of dealing with it. I believe at one time I had a large bolt threaded into the rubber line.

Help please!!

thanks
brian

 

[Purple77CJ7]

Try blowing compressed air through the lines. The supply line should bubble in the tank. The return line just goes in the top of the tank.

 

[jeepboy45]

Try blowing compressed air through the lines. The supply line should bubble in the tank. The return line just goes in the top of the tank.

Good call...I'll try that after work tomorrow
thanks

I was able to barely see over the top of my gas tank. Two lines come from the same place, I believe supply and return... Then there is a third coming from another "outlet" on top of the tank. I believe the "third" one is the vent line.

I replaced the stock tank with a 20 gallon poly one about 10 years ago I got one off a Jeep CJ in the JY but failed to record what year model it. Currently I'm looking for a diagram of one.

 

[Saddle Tramp]

Try this picture. Note the California version is different from the other 49.