i was just test fitting the size witha box wrench b4 i went out and spent 20 bucks on a flare nut wrench. the 3/8 flare nut wrench fits but not as snug as i would like. whats up with a domestic vehicle using both standard and metric sizes??? I know with the imports i have had in the past they were all metric, no mixing and matching BS.
That's fine until you get a rusted one that's really stuck, whereupon the cut-open wrench may spread, and once it slips on the fitting, you might as well just have barfed it up with vise grips. Nowadays I won't even use budget flare nut wrenches for removal of fittings, even if they work fine to put them back. My wrench of choice is S-K, and yes, it's pretty pricey. I think the 3/8 x 7/16 one will serve almost all your Jeep needs. Your mileage may, of course, vary, but long ago I determined that a high quality wrench pays for itself in aggravation and parts runs almost instantaneously. A good one will last just about forever if you don't lose it, so that 20 bucks is spread pretty thin.$20 for a single wrench? What I do is either use one of my old boxed end wrenches or but a new one then using a cutoff wheel I cut a slot in the boxed end, just wide enough to let the line pass through. I cut the slot at 12 O'clock or in-line with the handle. I also heat up the wrench in a vise and bend the end to about forty-five degrees, then stick it in cold water. It's probably not as strong as a dedicated flare nut wrench but they have worked well for me.
That's fine until you get a rusted one that's really stuck, whereupon the cut-open wrench may spread, and once it slips on the fitting, you might as well just have barfed it up with vise grips. Nowadays I won't even use budget flare nut wrenches for removal of fittings, even if they work fine to put them back. My wrench of choice is S-K, and yes, it's pretty pricey. I think the 3/8 x 7/16 one will serve almost all your Jeep needs. Your mileage may, of course, vary, but long ago I determined that a high quality wrench pays for itself in aggravation and parts runs almost instantaneously. A good one will last just about forever if you don't lose it, so that 20 bucks is spread pretty thin.
I couldn't agree more with using quality tools. I have complete sets of Craftsman metric and SAE flare nut wrenches. I only make my own when I run into special clearance issues.
I bought my first socket set (SK Tools) when I was 16 and still use it, and that's almost 50 years!