Flare nut stripped on fuel line

Hey everyone I saw my fuel filter was spraying fuel and so I tried changing it and the bolts were too rusty so I decided to change the lines as well but now the nut on the upstream end of the line(sorry don’t know the real term I’m not a mechanic) is rounded off and I’m not sure where to go from here. All help appreciated

 

If the threads are good. Use vice grips. Else get a new upstream line.

 

Also, there are special wrenches to use on flare nuts so that “rounding off” the corners is far less plausible. Pic attached. If you decide to buy some, Harbor Freight has a set that works just fine. Remember though, there metric and SAE types.

 

Thank you!

 

This style works well. I even use a cheater on it.

 

Where you get that one? That looks like it’s up to any seized flare nut job.

 

I got mine online from Ebay. Was about $20. Search "ratcheting flarenut wrench". (WTF=won"t trash flarenuts.)

 

Thanks.

 

Appears no longer made. Did find some sorta similar ratcheting wrenches.