1. What type of o-ring fitting is this called 2. is it different between a/c and fuel and 3. is there a hand tool to make that kind of fitting?
1. Dunno 2. Not sure if there are differences (sizes maybe), but probably differences in the o ring / washer due to pressures and materials. 3. Yes. I have a Mastercool (hand operated hydraulic) that will form the crimp on the tubing. Kinda spendy but if you do much with brake pipes it's worth it. Probably just about any garage that deals with anything remotely modern should be able to help you out. Chris
The tube is formed with a flange, rather than a flare, the flange backs up the o-ring so it’s not damaged by the tube nut. I suppose you could use that type for fuel but you would need the proper female fitting. The green o-ring shown is recommended for 134a A/C installations.
1.Straight thread o ring fitting 2. yes ac o rings need to be able to be used with the oil in an ac system 3 yes @Happydaze mentioned the tool.
I think that’s like a GM fuel filter fittings (90s-2000s) and a/c 134a. The o ring denotes what type of system it’s used in. Like said above the Mastercool tool will make that shape.
Just to clarify, a typical Mastercool set will do more than brake flares. Mine will do 45 and 37 degree single and double flares in 3/16, 1/4, 3/8 and maybe 1/2 tube as well as the fuel /a/c crimps (won't call them flares) in, I think, a couple of sizes. More applications than I imagine I will ever use but I'm more than happy with the use I've had. Chris
I have the Mastercool tool that operates with a wrench. It is the same tool body, just with a forcing screw, instead of the hydraulic ram. I opted for that one, because I do AC hoses only 2-3 times-a-year. It is much less expensive. It is $167.99, versus, $577.09. It does not, however, come with crimping dies for slim-line hoses. Those are less common, though. They can be had separately, if desired.
are most flares like on brake lines 45 or 37 degrees? and... where do you need to double flare vs single flare?
37º can also be steel fittings for hydraulics, as well, as JIC is the fit equivalent of AN. I have AN, JIC and SAE 45º inverted flare all on the same car, as fuel, power steering, and brakes, respectively.
So if I go to the hardware store or lowes they carry the brass water compression and flare fittings. I am only dealing with 37psi of fuel pressure so I think it might work.. Question is can I use brass flare nuts on steel line with a single flare to hold 37psi?
Sounds like you mean compression fittings and olives? There's no flare as such or flare nuts with compression fittings. Compression fittings should be ample for 37psi (that's at the lower end of domestic water pressure). What are you using 37psi of fuel pressure on? Just curious. Chris
Injected Chevy L82. From what I have read most injected cars run from 35 to 65 psi. If I use an AN fitting can I get away with a single flare on a steel line. Double flares are a pain on steel lines with the hand tool I have.
Your flaring tool does 45* flares and AN requires 37*. There are other differences too, like the need for the tube sleeve in addition to the tube nut for tube used with 37* flares. Check out this video- I don’t know how to post a link on my iPhone so you’ll have to enter it yourself. youtube.com/watch?v= BRcTnt1Egvo The second half deals with AN hard line flares and assembly.
They make an AN fitting that is compression on one end for steel line and 37 degree AN on other end. Summit has them, good for 100 psi.
Fordors, the brass plumbing fittings at the hardware store are 45 degrees, right? I could use a union double flare and flare nuts and flare the steel line.
I wouldn’t. You won’t compress into the steel line with a brass ferrule. The ferrule will “snug up” around the steel line, but won’t indent it. The indent holds it in place, the tapers seat it.
Dorman makes some fuel line repair kits with a similar barb on the end. They are s teel line with a brass compression fitting. https://shop.advanceautoparts.com/p...gfZNmMavtbkiCvzx20caAgsGEALw_wcB&gclsrc=aw.ds
You don't need the brass ferrule to compress the line , the " compression " of the ferrule forms the seal . if its deforming the line its actually over tightened . A single 45° flare will hold 200 p.s.I. easily , the only need for double flaring is with high pressure hydraulics ,I.e. brake lines .
I’m not a Corvette guy but I do know Chevy engines. All the L-82’s I’m aware of were carbureted, what is it you are working with?
That's going to fly like a Lead balloon here. I can only assume based on what you are asking about that you are using a Rochester TBI throttle body. If that is the case, there are adapters that go from straight thread metric o-ring, to AN-6. There is no need to use the late-model fittings anywhere but the end of those two adapters.
Let not get too far into the weeds but I am learning about about fittings. So it appears that 2 people here differ on using a 45 degree brass flare union for steel line. I can see if the flares match thats where the seal is but I also know that those brass fittings are used with copper lines. Not sure if I have seen steel line with brass fittings. Looking at maybe 60psi max. So if I go with steel I am looking at an AN fitting? right or do those come in other materials like aluminum. I assume they make a 37 degree flare tool. The repair line link is good (actually need 16mm) and I like it but still need the union flare. to join them. My fuel line is odd, not quite 3/8. reads about .380 or .390 cant remember, slight over 3/8 but with a flare who cares.
Since you're dissatisfied with the suggestions given you. You could go to any number of manufacturer s & distributers sights & compile your own data ! There's any number of charts availability. Info , materials compatibility , pressure info on the web .
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